BIOS Beeps

What is a B.I.O.S.? A Basic Input Output System

Why does it beep ? For diagnostics

 
 
 

ACER BIOS POST Codes

 
04 CPU verification; POST start
08 Shutdown condition 0; Shutdown byte 0
0C BIOS ROM checksum tested
10 CMOS ROM shutdown byte tested
14 DMA controller tested
18 System timer initialized
1C Memory refresh system tested
1E Memory type determined
20 Base 128K memory tested
24 8042 keyboard controller tested
28 CPU descriptor instruction tested
2C 8259 PIT tested
30 Temporary Interrupts located and initialized
34 BIOS Interrupt vectors and routines configured
38 CMOS RAM tested
3C Memory size determined
40 Shutdown condition 1
44 Video BIOS ROM initialized
45 RAM initialized and tested
46 Cache memory and controller initialized and tested
48 Memory tested
4C Shutdown condition 3
50 Shutdown condition 2
54 Shutdown condition 7
58 Shutdown condition 6
5C Keyboard and auxiliary I/O tested
60 BIOS Interrupt routines setup
64 RTC tested
68 Floppy drive and controller tested
6C Hard drive and controller tested
70 Parallel port tested
74 Serial port tested
78 Time of day setup
7C Optional ROM's searched for and started
80 Math coprocessor tested
84 Keyboard tested
88 System initialized
8C System initialized
90 Operating system boot process started
94 Shutdown condition 5
98 Shutdown condition A
9C Shutdown condition B
 
 


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ALR BIOS POST Codes

 
01 CPU register test in progress
02 Real-time clock write/read failure
03 ROM BIOS checksum failure
04 Programmable internal timer failure (or no video card present)
05 DMA initialization failure
06 DMA page register write/read failure
08 RAM-refresh verification failure
09 1st 64KB RAM test in progress
0A 1st 64KB RAM chip or data line multi-bit failure
0B 1st 64KB RAM odd/even logic failure
0C Address line failure 1st 64KB RAM
0D Parity failure 1st 64KB RAM
10-1F bit 0-15 64KB RAM failure
20 Slave DMA-register failure
21 Master DMA-register failure
22 Master-interrupt mask-register failure
23 Slave-interrupt mask-register failure
25 Interrupt vector loading in progress
27 Keyboard-controller test failure
28 RTC power failure and checksum calculation in progress
29 Real-time clock-configuration validation in progress
2B Screen-memory test failure
2C Screen-initialization failure
2D Screen-retrace test failure
2E Search believed operational on screen believed running with video ROM
30 Monochrome display believed operable
32 Color display (40 column) believed operable
33 Color display (80 column) believed operable
 
 


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Original IBM Beep Codes
 
 

AMI BIOS Beep Codes

Beeps

Error Message

Description

1 short DRAM refresh failure The programmable interrupt timer or programmable interrupt controller has probably failed
2 short Memory parity error A memory parity error has occurred in the first 64K of RAM.  The RAM IC is probably bad
3 short Base 64K memory failure A memory failure has occurred in the first 64K of RAM.  The RAM IC is probably bad
4 short System timer failure The system clock/timer IC has failed or there is a memory error in the first bank of memory
5 short Processor error The system CPU has failed
6 short Gate A20 failure The keyboard controller IC has failed, which is not allowing Gate A20 to switch the processor to protected mode. Replace the keyboard controller
7 short Virtual mode processor exception error The CPU has generated an exception error because of a fault in the CPU or motherboard circuitry
8 short Display memory read/write error The system video adapter is missing or defective
9 short ROM checksum error The contents of the system BIOS ROM does not match the expected checksum value.  The BIOS ROM is probably defective and should be replaced
10 short CMOS shutdown register read/write error The shutdown for the CMOS has failed
11 short Cache error The L2 cache is faulty
1 long, 2 short Failure in video system An error was encountered in the video BIOS ROM, or a horizontal retrace failure has been encountered
1 long, 3 short Memory test failure A fault has been detected in memory above 64KB
1 long, 8 short Display test failure The video adapter is either missing or defective
2 short POST Failure One of the hardware testa have failed
1 long POST has passed all tests  
 


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AMIT/AMI BIOS POST Codes

 

BIOS from 1991 - Present
51-0102-zz5123-00111111-101094-AMIS875-P
The red indicates a motherboard with BIOS from 1991 to the present

NMI Disable NMI interrupt line to the CPU is disabled by setting bit 7 I?O port 70h (CMOS)
Power On Delay Once the keyboard controller gets power, it sets the hard and soft reset bits.  Check the keyboard controller or clock generator if a failure occurs
Initialize Chipsets Check the BIOS, CLOCK and chipsets
Reset Determination The BIOS reads the bits in the keyboard controller to see if a hard or soft reset is required (a soft reset will not test memory above 64K).  Failure could be the BIOS or keyboard controller
ROM BIOS Checksum The BIOS performs a checksum on itself and adds a preset factory value that should make it equal to 00.  If a failure occurs, check the BIOS chips
Keyboard Test A command is sent to the 8042 keyboard controller which performs a test and sets a buffer space for commands.  After the buffer is defined the BIOS sends a command byte, writes data to the buffer, checks the high order bits of the internal keyboard controller and issues a No Operation (NOP) command
CMOS Shutdown byte in CMOS RAM offset 0F is tested, the BIOS checksum calculated and diagnostic byte 0E updated before the CMOS RAM area is initialized and updated for date and time.  Check the RTC and CMOS chip or battery if a failure occurs
DMA (8237) and PIC (8259) Disable The DMA and Programmable Interrupt Controller are disabled before the POST proceeds and further.  Check the 8237 or 8259 chips if a failure occurs
Video Disable The video controller is disabled and port B initialized.  Check the video adapter if a failure occurs
Chipset Initialized and Memory Detected Memory addressed in 64K blocks.   Failure would be in the chipset.  If all memory is not seen, failure could be in a chip in the block after the last one seen
PIT Test The timing functions of the 8254 Programmable Interrupt Timer are tested.  The PIT and RTC chips normally cause errors here
Memory Refresh PIT's ability to refresh memory is tested.  If an XT, DMA controller #1 handles this.  Failure is normally the PIT (8254) in AT's or the 8237, DMA #1, in XT's
Address Line Test the address lines in the first 64K of RAM.  If a failure occurs, an address line may be the problem
Base 64K Data patterns are written to the first 64K of RAM, unless there is a bad RAM chip in which case you will get a failure
Chipset Initialization The PIT, PIC and DMA controllers are initialized
Set Interrupt Table Interrupt vector table used by PIC is installed in low memory, the first 2K
8042 Keyboard Controller Check The BIOS reads the buffer area in the keyboard controller I/O port 60.  Failure here is normally the keyboard controller
Video Tests The type of video adapter is checked for, then a series of tests are performed on the adapter and monitor
BIOS Data Area The vector table is checked for proper operation and video memory verified before protected mode tests are entered into.   This is done so that any errors found are displayed on the monitor
Protected Mode Tests Perform reads and writes to all memory locations below 1MB.  Failure at this point indicate a bad RAM chip, the 8042 Keyboard Controller or a data line
DMA Chips The DMA registers are tested using a data pattern
Final Initialization these differ with each version.   Typically, the floppy and hard drives are tested and initialized and a check is made for serial and parallel devices.  The information gathered is then compared against the contents of the CMOS and you will see the results of any failures on the monitor
BOOT The BIOS hands over control to the Int 19 bootloader.  This is where you would see error messages such as non-system disk


AMIT BIOS Post Codes (Prior to April 1990)

01 NMI is disabled and the i286 register test is about to start
02 i286 register test has passed
03 ROM BIOS checksum test (32Kb from F8000h) passed OK
04 8259 programmable interrupt controller has initialized OK
05 CMOS interrupt disabled
06 Video system disabled and the system timer checks OK
07 8253/4 programmable-interval timer test OK
08 Delta counter channel 2 OK
09 Delta counter channel 1 OK
0A Delta counter channel 0 OK
0B Parity status cleared
0C The refresh and system timer check OK
0D Refresh check OK
0E Refresh period checks OK
10 Ready to start 64KB base memory test
11 Address line test OK
12 64KB base memory test OK
13 System-interrupt vectors initialized
14 8042 keyboard controller checks OK
15 CMOS read/write test OK
16 CMOS checksum and battery OK
17 Monochrome video mode OK
18 CGA color mode set OK
19 Attempting to pass control to video ROM at C0000h
1A Returned from video ROM
1B Display memory read/write test OK
1C Display memory read/write alternative test OK
1D Video retrace test OK
1E Global equipment byte set for proper video operation
1F Ready to initialize video system
20 Video test OK
21 Video display OK
22 The power-on message is displayed
30 Ready to start the virtual-mode memory test
31 virtual memory mode test started
32 CPU has switched to virtual mode
33 Testing the memory address lines
34 Testing the memory address lines
35 Lower 1MB of RAM found
36 Memory size computation checks OK
37 Memory test in progress
38 Memory below 1MB is initialized
39 Memory above 1MB is initialized
3A Memory size is displayed
3B Ready to test the lower 1MB of RAM
3C Memory test of lower 1MB OK
3D Memory test above 1MB OK
3E Ready to shutdown for real-mode testing
3F Shutdown OK- now in real mode
40 Ready to disable gate A20
41 A20 line disabled successfully
42 Ready to start DMA controller test
4E Address line test OK
4F System still in real mode
50 DMA page register test OK
51 Starting DMA controller 1 register test
52 DMA controller 1 test passed, starting DMA controller 2 register test
53 DMA controller 2 test passed
54 Ready to test latch on DMA controller 1 and 2
55 DMA controller 1 and 2 latch test OK
56 DMA controller 1 and 2 configured OK
57 8259 programmable interrupt controller initialized OK
58 8259 programmable interrupt controller mask register OK
59 Master 8259 programmable interrupt controller mask register OK
5A Ready to check timer interrupts
5B Timer interrupt check OK
5C Ready to test keyboard interrupt
5D Error detected in timer or keyboard interrupt
5E 8259 programmable interrupt controller error
5F 8259 programmable interrupt controller OK
70 Start of keyboard test
71 Keyboard controller Ok
72 Keyboard tested OK
73 Keyboard global initialization OK
74 Floppy setup ready to start
75 Floppy controller setup OK
76 Hard disk setup ready to start
77 Hard disk controller setup OK
79 Ready to initialize timer data
7A Verifying CMOS battery power
7B CMOS battery verified OK
7D Analyzing CMOS RAM size
7E CMOS memory size updated
7F Send control to adapter ROM
80 Enable the setup routine if <Delete> is pressed
82 Printer data initialization is OK
83 RS-232 data initialization is OK
84 80x87 check and test OK
85 Display any soft-error message
86 Give control to ROM E0000h
87 Return from system ROM
00 Call the Int19 boot loader
 
 


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Arche Legacy BIOS POST Codes

 
01 Disable the NMI and test CPU registers
02 Verify the BIOS ROM checksum (32KB at F8000h)
03 Initialize the keyboard controller and CMOS RAM communication
04 Disable the DMA and PIT; test the CMOS RAM interrupt
05 Reset the video controller
06 Test the 8254 programmable interrupt timer
07 Test delta count timer channel 2 (speaker)
08 Test delta count timer channel 1 (memory refresh)
09 Test delta count timer channel 0 (system timer)
0A Test parity circuit and turn on refresh
0B Enable parity check and test system timer
0C Test refresh trace link toggle
0D Test refresh timing synchronization
10 Disable cache and shadow memory; test the 64KB base memory
11 Perform 64KB memory read/write test
12 Initialize interrupt vector table in lower 1KB of RAM
14 Test CMOS RAM shutdown register...disable DMA and interrupt controllers
15 Test CMOS RAM battery and checksum
16 Test for floppy drive, based on CMOS setup...initialize monochrome video
17 Initialize CGA video
18 Clear the parity status (if any)
19 Test for EGA/VGA video BIOS at C0000h and pass control
1A Return from video ROM
1B Test primary video adapter...test video memory
1C Test secondary video adapter...test video memory
1D Compare CMOS settings to video adapter
1E Set video mode according to CMOS settings
20 Display CMOS RAM read/write errors and halt
21 Set cursor and call interrupt 10 to display status message
22 Display power on message; "386 BIOS"; check if CPU speed is 25Mhz or 33Mhz
23 Read new cursor position
24 Display AMI copyright message at the bottom of the screen
25 Test shadow RAM
F0 Shadow RAM test failed
30 Ready to enter protected mode
31 Enter protected mode (A20 gate) and enable timer interrupt (IRQ 0)
32 Get memory size above 1MB
33 Get memory size below 640KB
34 Test memory above 1MB
35 Test memory below 1MB
37 Clear memory below 1MB
38 Clear memory above 1MB
39 Use CMOS shutdown byte and return to real mode
3A Test 64KB read/write
3B Test RAM below 1MB and show the area being tested
3C Test RAM above 1MB and show the area being tested
3D RAM test complete OK
3E Ready to return to real mode
3F Back in real mode
40 Disable A20 gate
41 Check for AMI copyright message in ROM
42 Display the AMI copyright message, if found
43 Test cache memory; Clear <Esc> message
4E Process shutdown 1; Return to real mode
4F Restore interrupt vectors and data in BIOS RAM area
50 Test DMA controller
51 Initialize DMA controller
52 Test the DMA controller with patterns
54 Test DMA controller latches
55 Initialize and enable DMA controllers 1 and 2
56 Initialize 8259 programmable interrupt controllers
57 Test 8259 programmable interrupt controllers and setup interrupt mask registers
61 Check DDNIL status bit and display message
70 Perform keyboard (BAT) basic assurance test
71 Program keyboard to AT type
72 Disable keyboard and initialize keyboard circular buffer
73 Display message and initialize floppy controller and drive
74 Attempt to access the floppy drive
75 If the CMOS RAM is good, check and initialize the hard disk controller and drive
76 Attempt to access the hard disk drive
77 Shuffle and internal error codes
79 Check CMOS RAM battery and checksum...clear parity status
7A Compare size of base/extended memory to CMOS information
7B Unknown AMI function
7C Display AMI copyright
7D Set AT memory expansion bit
7E Verify the ROM contains and AMI copyright
7F Clear the <Del> message from the display...check if <Del> was pressed
80 Locate option ROM at C800h to DE00h and pass control to any found
81 Return from option ROM and initialize timer and data area
82 Setup parallel and serial ports
83 Test for math coprocessor
84 Check if keyboard is locked
85 Display any soft error messages
86 Test for option ROM at E0000h
A0 Error found in 256KB or 1MB RAM IC in lower 640KB
A1 Base 64KB random access and data pattern test (only in 386APR and Presto 386SX BIOS)
A9 Initialize on board VGA controller (Presto 386SX BIOS)
B0 Error in 256KB RAM IC in 640KB
B1 Base 64KB random access and data pattern test (only in Presto 386SX BIOS)
E0 Return to real mode and initialize base 64KB RAM (Presto)
E1 Initialize 640KB RAM (Presto)
EF Configuration memory error - can't find memory
F0 Test shadow RAM from 04000h
00 Call the interrupt 19 boot loader
 
 


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Original IBM Beep Codes
 
 

AST BIOS Beep Codes

Beeps

Error Message

Description

1 short CPU register test failure The CPU has failed
2 short Keyboard controller buffer failure The keyboard controller has failed
3 short Keyboard controller reset failure The keyboard controller has failed or the motherboard circuitry is faulty
4 short Keyboard communication failure Either the keyboard controller IC or the associated circuitry has failed.  replace the keyboard first, then is still faulty, replace the keyboard controller IC
5 short Keyboard input failure The keyboard controller IC has failed.   Replace the IC
6 short System board chipset failure The chipset on the motherboard has failed.  Replace the motherboard
9 short BIOS ROM checksum error The BIOS ROM has failed.  If possible, replace the BIOS on the motherboard
10 short System timer test failure The system clock IC has failed
11 short ASIC failure Motherboard circuitry has failed.   Replace the motherboard
12 short CMOS RAM shutdown register failure THE real time clock/CMOS IC failed.   Replace the CMOS or motherboard
1 long DMA controller 0 failure The DMA controller IC for channel 0 has failed.  If possible, replace the IC
1 long, 1 short DMA controller 1 failure The DMA controller IC for channel 1 has failed.  If possible, replace the IC
1 long, 2 short Video vertical retrace failure The video adapter has probably failed.   Replace the video adapter
1 long, 3 short Video memory test failure The video adapter's memory has failed.   Replace the video adapter
1 long, 4 short Video adapter failure The video adapter has failed.   Replace the video adapter
1 long, 5 short 64KB memory failure A failure has occurred in the base 64KB of memory.  If possible, replace the RAM IC
1 long, 6 short Unable to load interrupt vectors The BIOS was unable to load the interrupt vectors into memory
1 long, 7 short Unable to initialize video This a video problem. Replace the video adapter first.  If problem is still present, replace the motherboard
1 long, 8 short Video memory failure The is a failure in the video memory.   Replace the video adapter first.  If problem is still present, replace the motherboard
 


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AST BIOS POST Codes

 
00 Reserved; Beep and halt if error occurs
01 Test CPU registers
02 Test the 8042 keyboard controller buffer
03 Test the 8042 keyboard controller reset
04 Verify presence of keyboard and check communication
05 Read keyboard input port (WS386SX16)
06 Initialize system board support chipset
09 Test BIOS ROM checksum
0D Test 8254 programmable interrupt timer registers (13 short beeps)
0E Test ASIC registers (CLEM only, 14 short beeps)
0F Test CMOS RAM shutdown byte (15 short beeps)
10 Test DMA controller 0 registers
11 Test DMA controller 1 registers
12 Test DMA page registers (EGA.VGA vertical retrace failed)
13 EGA/VGA RAM test failed
14 Test memory refresh toggle (EGA/VGA CRT registers failed)
15 Test base 64KB memory
16 Set interrupt vectors in base memory
17 Initialize video
18 Test display memory
20 EISA bus board power on (EISA systems only)
30 Test programmable interrupt controller #1 mask register
31 Test programmable interrupt controller #2 mask register
32 Test programmable interrupt controller's for stuck interrupts
33 Test for stuck NMI (P386 25.33, P486, CLAM and EISA)
34 Test for stuck DDNIL status (CLEM only)
40 Test CMOS RAM backup battery
41 Calculate and verify CMOS checksum
42 Setup CMOS RAM options (except WS386SX16)
50 Test the protected mode
51 Test protected mode exceptions
60 Calculate RAM size
61 Test RAM
62 Test shadow RAM (WS386SX16, P386 25/33, P486, CLEM, EISA); test cache (P386/16)
63 Test cache memory (P386 25/33, P486, CLEM, EISA); copy video BIOS to shadow RAM (p386C, P386/16, WS386SX16)
64 Copy system BIOS to shadow RAM (P386 25/33, P486, CLEM,EISA); Copy video BIOS to shadow RAM (P386 16, WS386SX16)
65 Copy video BIOS to shadow RAM P386 25/33, P486, CLEM,EISA); Test cache (WS386SX16)
66 Test 8254 programmable interrupt timer channel 2 (P386 25/33, P486, EISA)
67 Initialize memory (Eagle only)
 
 


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ATT BIOS POST Codes

 
01 CPU test
02 System I/O port test
03 ROM checksum test
05 DMA page register test
06 Timer 1 test
07 Timer 2 test
08 RAM refresh test
09 8/19 bit bus conversion check
0A Interrupt controller 1 test
0B Interrupt controller 2 test
0C Keyboard controller test
0D CMOS RAM/RTC test
0E Battery power test
0F CMOS RAM checksum test
10 CPU protected mode
11 Display configuration test
12 Display controller test
13 Primary display error
14 Extended CMOS test
15 AT bus reset
16 Initialize chipset registers
17 Check for extension ROM's
18 Internal memory address test
19 Remap memory
1A Memory interleave mode test
1B Remap shadow memory
1C Setup MRAM
1D Expanded memory test
1E AT memory error
1F Internal memory error
20 Minimum POST tests complete
21 DMA controller 1 test
22 DMA controller 2 test
23 Timer 0 test
24 Initialize internal controllers
25 Unexpected interrupt
26 Expected interrupt
30 Switch to protected mode
31 Size AT bus memory or size external memory
32 Address lines A16 to A23 test
33 Internal memory test or conventional memory test
34 AT bus memory test or external memory test
38 Shadow ROM BIOS to RAM
39 Shadow extension BIOS to RAM
40 Enable/disable keyboard
41 Keyboard clock and data test
42 Keyboard reset
43 Keyboard controller test
44 A20 gate test
50 Initialize interrupt table
51 Enable timer interrupt
60 Floppy controller/drive test
61 Hard disk controller test
62 Initialize floppy drives
63 Initialize hard drives
70 Real time clock test
71 Set real time clock
72 Test parallel interfaces
73 Test serial interfaces
74 Check external ROM's
75 Numeric coprocessor test
76 Enable keyboard and RTC interrupts (IRQ 9)
F0 Display system startup message
F1 Check for ROM at E000h
F2 Boot from floppy or hard disk
F3 Run setup program
F4 Run password program
FC DRAM type detection
FD CPU register test
 
 


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Original IBM Beep Codes
 
 

AWARD BIOS Beep Codes

Beeps

Error Message

Description

1long, 2 short Video adapter error Either video adapter is bad or is not seated properly.  Also, check to ensure the monitor cable is connected properly.
Repeating (endless loop) Memory error Check for improperly seated or missing memory.
1long, 3short No video card or bad video RAM Reseat or replace the video card.
High frequency beeeps while running Overheated CPU Check the CPU fan for proper operation. Check the case for proper air flow.
Repeating High/Low CPU Either the CPU is not seated properly or the CPU is damaged. May also be due to excess heat. Check the CPU fan or BIOS settings for proper fan speed.
 


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Award BIOS POST Codes

 

EISA POST Codes are typically output to port address 30h

ISA POST Codes are typically putput to port address 80h

AWARD Test Sequence up to Version 4.2

CPU BIOS sets, verifies and resets the error flags in the CPU.  Failure here is normally due to the CPU or system clock
POST Determination BIOS determines whether the motherboard is set for normal operation or a continuous loop of POST.  If the POST test is cycled 1-5 times over and over either the jumper for this function is set to burn=in or the circuitry involved has failed
Keyboard Controller BIOS tests the internal operations of the keyboard controller chip (8042).   Failure here is normally due to the keyboard chip
Burn In Status 1-5 will repeat if the motherboard is set to burn in.  If you haven't set the motherboard for burn-in mode, there is a short in the circuitry
Initialize Chipset BIOS clears all DMA registers and CMOS status bytes 0E and 0F.  BIOS then initializes 8254 timer,  Failure of this test is probably due to the timer chip
CPU A bit-pattern is used to verify the functioning of the CPU registers.  Failure here is normally down to the CPU or clock chip
RTC BIOS verifies that the real time clock is updating CMOS at normal intervals.  Failure is normally the CMOS/RTC or the battery
ROM BIOS Checksum BIOS performs a checksum of itself against a predetermined value that will equal 00.  Failure is down to the ROM BIOS
Initialize Video BIOS tests and initializes the video controller.  Failure is normally the video controller (6845) or an improper setting of the motherboard or CMOS
PIT BIOS tests the functionality of channels 0, 1, and 2 in sequence.  Failure is normally the PIT chip (8254/53)
CMOS Status Walking bit pattern tests CMOS shutdown status byte 0F.  Failure normally in CMOS
Extended CMOS BIOS checks for any extended information of the chipset and stores it in the extended RAM area.  Failure is normally due to invalid information and can be corrected by setting CMOS defaults.  Further failure indicates either the chipset or the CMOS RAM
DMA Channels 0 and 1 are tested together with the page registers of the DMA controller chip (8237).  Failure is normally due to the DMA chips
Keyboard The 8042 keyboard controller is tested for functionality and for proper interfacing functions.  Failure is normally due to the 8042 chip
Refresh Memory refresh is tested; the standard with walking - bit patterns.  Failure is normally the PIT chip in AT's or the DMA chip in AT's
Memory The first 64K of memory is tested with walking bit patterns.  Failure is normally due to the first bank of ram or a data line
Interrupt Vectors The BIOS interrupt vectors table is loaded to the first bank of RAM.  Failure here is not likely since memory in the area has been tested.  If failure does occur suspect the BIOS or RTC
Video ROM Video ROM is initialized which performs an internal diagnostic before returning control to the system BIOS.  Failure is normally the video adapter or the BIOS
Video Memory This is tested with a bit pattern.   This is bypassed if there is a ROM on the video adapter.  Failure is normally down to the memory on the adapter
PIC The functionality of the interrupt controller chip(s) is tested (8259).  Failure is normally due to the 8259 chips but may be the clock
CMOS Battery BIOS verifies that CMOS byte 0D is set which indicates the CMOS battery power.  Suspect the battery first and the CMOS second
CMOS Checksum A checksum is performed on the CMOS.   Failure is either incorrect setup, the CMOS chip or battery.  If the test is passed, the information is used to configure the system
Determine System Memory Memory up to 640K is addressed in 64K blocks.  Failure is normally due to an address line or DMA chip.  If all the memory is not found there is a bad RAM chip or address line in the 64K block above the amount found
Memory Test Tests are performed on any memory found and there will normally be a message with the hex address of any failing bit displayed at the end of boot
PIC Further testing is done on the 8259 chips
CPU Protected Mode The processor is placed in protected mode and back into real mode; the 8042 is used for this.  In case of failure suspect the 8042, CPU, CMOS, or the BIOS in that order
Determine Extended Memory Memory above 1MB is addressed in 64K blocks.  The entire block will be inactive if there is a bad RAM chip on a block
Test Extended Memory Extended memory is tested with a series of patterns.  Failure is normally down to a RAM chip, and the hex address of the failed bit should be displayed
Unexpected Exceptions BIOS checks for unexpected exceptions in protected mode.  Failure is likely to be a TSR or intermittent RAM failure
Shadow Cache Shadow RAM and cache are activated.   Failure may be due to the cache controller or chips.  Check the CMOS first for invalid information
8242 Detection BIOS checks for an Intel 8242 keyboard controller and initializes it if found.  Failure may be due to an improper jumper setting or the 8242
Initialize Keyboard Failure could be the keyboard or controller
Initialize floppy All those set in the CMOS.  Failure could be incorrect CMOS setup or floppy controller or the drive
Detect Serial Ports BIOS searches for and initializes up to four serial ports at 3F8, 2F8, 3E8, and 2E8.  Detection failure is normally due to an incorrect jumper setting somewhere or an adapter failure
Detect Parallel Ports BIOS searches for and initializes up to four parallel ports at 378, 278, 3BC, and 2BC.  Detection failure is normally due to an incorrect jumper setting somewhere or an adapter failure
Initialize Hard Drive BIOS initializes any hard drive(s) set in the CMOS.  Failure could be due to invalid CMOS setup, hard drive or controller failure
Detect NPU Coprocessor Initialization of any NPU coprocessor found.  failure is due either to invalid CMOS setup or the NPU is failing
Initialize Adapter ROM Any Adapter ROM's between C800 and EFFF are initialized.  The ROM will do an internal test before giving back control to the system ROM.  Failure is normally due to the adapter ROM or the attached hardware
Initialize External Cache Any external cache to the 486 is enabled.  Failure would indicates invalid CMOS setup, cache controller or chip failure
NMI Unexpected Exceptions A final check for unexpected exceptions before giving control to the Int 19 boot loader.  Failure is normally due to a memory parity error or an adapter failure
Boot Errors Failure when the BIOS attempts to boot off the default drive set in CMOS is normally due to invalid CMOS drive setup or as given by an error message.  If the system hangs there is an error in the Master Boot Record or the Volume Boot Record

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AWARD Test Sequence after version 4.2

CPU BIOS sets, verifies and resets the error flags in the CPU then performs a register test by writing and reading bit patterns.   Failure is normally due to the CPU or clock chip
Initialize Support Chips Video is disabled as is parity, DMA and NMI.  Then the PIT, PIC, and DMA chips are initialized.  Failure is normally the DMA or PIT chips
Initialize Keyboard Keyboard and controller are initialized
ROM BIOS Test A checksum is performed by the ROM BIOS on the data within itself and is compared to a preset value of 00.  Failure is normally due tot he ROM BIOS
CMOS Test A test of the CMOS chip which should also detect a bad battery.  Failure is due to either the CMOS chip or the battery
Memory Test First 356K of memory tested with any routines in the chipsets.  Failure is normally due to defective memory
Cache Initialization Any external cache to the chipset in activated.  Failure is normally due to the cache controller or chips
Initialize Vector Table Interrupt vectors are initialized and the interrupt table is installed into low memory.  Failure is normally due to the BIOS or low memory
CMOS RAM CMOS RAM checksum tested and BIOS defaults loaded if invalid.  Failure would indicate CMOS RAM failure
Keyboard Initialization Keyboard initialized and Num Lock set on.  Check the keyboard or controller is a failure occurs
Video Test Video adapter tested and initialized
Video Memory Tested for Mono and CGA adapters.   Failure could be the adapter card
DMA Test DMA controllers and page registers are tested.  Failure could indicate bad DMA chips
PIC Tests 8259 PIC chips are tested.  Failure would indicate a bad PIC
EISA Mode Test A checksum is performed on the extended data area of CMOS where EISA information is stored.  If passed the EISA adapter is initialized
Enable Slots Slots 0-15 doe EISA adapters are enabled if the above test is passed
Memory Size Memory addresses above 256K written in 64K blocks and addresses found are initialized.  If a bit is bad, the entire block containing it and those above will not be seen
Memory Test Read and write tests are performed on memory above 256K.  Failure is due to bad bit in RAM
EISA Memory Memory tests on any adapters initialize previously.  Check the memory chips if a failure occurs
Mouse Initialization Checks for a mouse and installs the appropriate interrupt vectors if one is found.  Check the mouse adapter if a failure occurs
Cache Initialized The cache controller is initialized if present
Shadow RAM Setup Any Shadow RAM present according to the CMOS is enabled
Floppy Test Test and initialize floppy controller and drive
Hard Drive Test Test and initialize hard disk controller and drive.  You may have an improper setup or a bad controller/hard drive if a failure occurs
Serial and Parallel Ports Amy serial and parallel ports are found and initialized
Math Coprocessor The coprocessor is initialized if found.   Check the CMOS setup or the math coprocessor if a failure occurs
Boot Speed Set the default speed at which the computer boots
POST Loop Reboot occurs if the loop pin is set for manufacturing purposes
Security Ask for a password if one has been set in the CMOS.
Write CMOS The BIOS is waiting to write the CMOS values from Setup to CMOS RAM.  Failure is normally due to an invalid CMOS configuration
Pre-Boot The BIOS is waiting to to write the CMOS values from Setup to CMOS RAM
Adapter ROM Initialization Adapter ROM's between C800 and EFFF are Initialized.  The ROM will do an internal test before giving back control to the system ROM.  Failure is normally due to the adapter ROM or the adapter card
Setup Time Set CMOS time to the value located at 40h of the BIOS data area
Boot System Control is given to Int 19 boot loader

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AWARD BIOS Text Error Messages

BIOS ROM checksum error - System halted The checksum of the BIOS code in the BIOS chip is incorrect, indicating the BIOS code may have become corrupt.  Replace the BIOS
CMOS battery failed CMOS battery is no longer functional.   Replace the battery
CMOS checksum error - Defaults loaded Checksum of CMOS is incorrect, so the system loads the default values.  A checksum error may indicate that CMOS has become corrupt.  This error might have been caused by a weak battery
CMOS CHECKSUM ERROR DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER Checksum of CMOS is incorrect.    This can indicate that CMOS has become corrupt.  This error may have been caused by a weak CMOS battery
CPU at nnn Displays the running speed of the CPU
DISKETTE DRIVES OR TYPES MISMATCH ERROR - RUN SETUP Type of diskette drive installed in the system is different from the CMOS definition.  Run Setup to reconfigure the drive type correctly
Display switch is set incorrectly The display switch on the motherboard can be set to either monochrome or color.  This message indicates the switch is set to a different setting than indicated in Setup.  Determine which setting is correct and then either turn off the system and change the jumper or enter Setup and change the video selector
DISPLAY TYPE HAS CHANGED SINCE LAST BOOT Since last powering off the system, the display adapter has been changed.  You must configure the system for the new display type
EISA Configuration Checksum Error The EISA nonvolatile RAM checksum is incorrect or cannot correctly read the EISA slot.  This can indicate either the EISA nonvolatile memory has become corrupted or the slot has been configured incorrectly.   Also, be sure the card in installed firmly in the slot
EISA Configuration Is Not Complete The slot configuration information stored in the EISA nonvolatile memory is incomplete
ERROR ENCOUNTERED INITIALIZING HARD DRIVE Hard drive cannot be initialized.   Be sure the adapter is installed correctly and all cables are correctly and firmly attached.  Also be sure the correct hard drive type is selected in Setup
ERROR INITIALIZING HARD DISK CONTROLLER Cannot initialize controller.  Make sure the card is correctly and firmly installed in the bus.  Be sure the correct hard drive type is installed in Setup.  Also check to see if any jumper needs to be set correctly on the hard drive
FLOPPY DISK CONTROLLER ERROR OR NO CONTROLLER PRESENT Cannot find or initialize the floppy disk controller.  make sure the controller is installed correctly and firmly.   If there are no floppy drives installed, be sure the Diskette Drive selection in Setup is set to None
Floppy disk(s) fail Cannot find or initialize the floppy drive controller or the drive.  make sure the controller is installed correctly.   If no floppy drives are installed, be sure the Diskette Drive selection in Setup is set to None or Auto
HARD DISK initializing Please wait for a moment... Some hard drives require some extra time to initialize
HARD DISK INSTALL FAILURE Cannot find or initialize the hard drive controller or the drive.  Make sure the controller is installed correctly.  If no hard drives are installed, be sure the Hard Drive selection in Setup is set to None
Hard disk(s) diagnosis fail The system may run specific disk diagnostic routines.  this message appears if one or more hard disks return an error when the diagnostics run
Invalid EISA Configuration The nonvolatile memory containing EISA configuration information was programmed incorrectly or has become corrupt.  Rerun EISA configuration utility to correctly program the memory
Keyboard error or no keyboard present Cannot initialize the keyboard.   Make sure the keyboard is attached correctly and no keys are being pressed during the boot.  If you are purposely configuring the system without a keyboard, set the error halt condition in Setup to HALT ON ALL, BUT KEYBOARD.  This will cause the BIOS to ignore the missing keyboard and continue the boot
Keyboard is locked out - Unlock the key This message usually indicates that one or more keys have been pressed during the keyboard tests.  Be sure no objects are resting on the keyboard
Memory Address Error at... Indicates a memory address error at a specific location.  You can use this location along with the memory map for your system to find and replace the bad memory chips
Memory parity Error at... Indicates a memory parity error at a specific location.  You can use this location along with the memory map for your system to find and replace the bad memory chips.
MEMORY SIZE HAS CHANGED SINCE LAST BOOT Memory has been added or removed since the last boot.  In EISA mode, use configuration utility to reconfigure the memory configuration.  In ISA mode,enter Setup and enter the new memory size in the memory field
Memory Test The message displays during a full memory test, counting down the memory areas being tested
Memory Test Fail If POST detects an error during memory testing, additional information appears giving specifics about the type and location of the memory error
Memory Verify Error at... Indicates an error verifying a value already written to memory.  Use the location along with your system's memory map to locate the bad chip
No boot device was found This could mean that either a boot device was not detected or the drive does not contain proper system boot files.   Insert a system disk into drive A: and press Enter.  If you assumed the system would boot from the hard drive, make sure the controller is inserted correctly and all cables are properly attached.  Also be sure the disk is formatted as a boot device.   Then reboot the system
OFFENDING ADDRESS NOT FOUND The message is used in conjunction with the I/O CHANNEL CHECK and RAM PARITY ERROR messages when the segment that has caused the problem cannot be isolated
OFFENDING SEGMENT: This message is used in conjunction with the I/O CHANNEL CHECK and RAM PARITY ERROR messages when the segment that has caused the problem has been isolated
Override enabled - Defaults loaded If the system cannot boot using the current CMOS configuration, the BIOS can override the current configuration with a set of BIOS defaults designed for the most stable, minimal-performance system operations
PRESS A KEY TO REBOOT This will be displayed at the bottom of the screen when an error occurs that requires you to reboot.  Press any key to reboot the system
Press ESC to skip memory test You can press ESC to skip the full memory test
PRESS F1 TO DISABLE NMI, F2 TO REBOOT When BIOS detects a non-maskable interrupt condition during boot, this will allow you to disable the NMI and continue to boot; or you can reboot the system with the NMI enabled
Press TAB to show POST screen System OEM's may replace the Award BIOS POST display with their own proprietary display.  Including this message in the OEM display permits the operator to switch between the OEM display
Primary master hard disk fail POST detects an error in the primary master IDE hard drive
Primary slave hard disk fail POST detects an error in the secondary master IDE hard drive
RAM PARITY ERROR - CHECKING FOR SEGMENT... Indicates a parity error in RAM
Resuming from disk, Press TAB to show POST screen Award offers a save-a-disk feature for notebook computers.  This message may appear when the operator restarts the system after a save-to-disk shutdown.  See the Press Tab...message earlier for a description of this feature
Secondary master hard disk fail POST detects an error in the secondary master IDE hard drive
Secondary slave hard disk fail POST detects an error in the secondary slave IDE hard drive
Should Be Empty But EISA Board Found A valid board ID was found in a slot that was configured as having no board ID
Should Have EISA Board But Not Found The board installed is not responding to the ID request, or no board ID has been found in the indicated slot
Slot Not Empty Indicates that a slot designated as empty by the EISA configuration utility actually contains a board
SYSTEM HALTED. (CTRL-ALT-DEL) TO REBOOT... Indicates the present boot attempt has been aborted and the system must be rebooted.  Press and hold down the Ctrl and Alt keys and press Del
Wrong Board In Slot The board ID does not match the ID stored in the EISA nonvolatile memory

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AWARD BIOS (Original XT)

03 Flag resister test
06 CPU register test
09 System hardware initialization
0C BIOS checksum
0F DMA page register initialization
12 Test DMA address and count registers
15 DMA initialization
18 Timer test
1B Timer initialization
1E Start RAM initialization
21 Test base 64K of RAM
24 Setup init. and temp stack
27 Initialize PIC
2A Interrupt mask register test
2D Hot interrupt test
30 V40 DMA if present
33 Verify system clock initialization
36 Keyboard test
39 Setup interrupt table
3C Read system configuration switches
3F Video test
42 Serial port determination
45 Parallel port determination
48 Game port determination
4B Copyright message display
4E Calculation of CPU speed
54 Test of system memory
55 Floppy drive test
57 System initialized before boot
5A Call to Int 19

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AWARD XT Version 3.1 BIOS

01 Processor test fail; Processor status verification #1
02 Type of POST/keyboard buffer; Failed if the keyboard interface buffer is filled with data
06 Initialize 6845 video controller, 8237 DMA controller, 8259 PIC, 8253 timer channel channel 1 initialized; Reset math coprocessor; Disable color and mono video, parity circuits and DMA chips; Clear DMA chips and page registers
07 Process registers except SS, SP, BP with data patterns 00 and FF; Processor status verification #2
09 ROM checksum for 32K tested
0A Initialize the 6845 video controller
15 Test first 64K of system memory
16 Set up interrupt table in first 64K
17 Set up video I/O operations
18 Test video memory
19 8259 mask bits-channel 1
1A 8259 mask bits-channel 2
1D Setup configuration byte from CMOS
1E Size memory and compare with CMOS
1F Test base memory; Test found system memory
20 Test stuck 8259's Interrupt bits
21 Test stuck NMI parity I/O bits
22 8259 Interrupt functionality tested
2A Keyboard initialized
2B Floppy dive controller and drive initialized
2C Initialize COM ports
2D Initialize LPT ports
2F Initialize math coprocessor
31 Initialize option ROM's
FF Int. 19 boot attempt

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AWARD Version 3.3 BIOS

01-05 Keyboard controller 8042 tested
06 On-board LSI initialized
07 CPU flags tested
08 Calculate CMOS checksum
09 Initialize the 8254 PIT
0A 8254 PIC tested
0B DMA controller tested
0C 8259 PIC initialized
0D 8259 PIC tested
0E ROM BIOS checksum tested
0F Extended CMOS tested
10 8259 PIC tested
11 8259 PIC tested
12 8259 PIC tested
13 8259 PIC tested
14 8259 PIC tested
15 First 64K RAM tested
16 Interrupt vector tables initialized
17 Video initialization
18 Video memory tested
19 Interrupt line mask 8259 PIC tested
1A Interrupt line mask 8259 PIC tested
1B Battery good
1C CMOS checksum verified
1D CMOS chip/RTC verified
1E Memory size checked
1F Memory verified
20 DMA initialized
21 PIC initialized
22 PIT initialized
24 Extended memory size checked
25 Extended memory tested
26 Protected mode entered
27 Shadow RAM, cache controller initialized
28 Shadow RAM, cache controller tested
29 Reserved
2A Initialize keyboard
2B Floppy drive initialization
2C Serial port initialization
2D Parallel port initialization
2E Hard disk initialization
2F Math coprocessor
30 Reserved
31 Optional ROM's checked for
FF Boot from Int 19

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AWARD EISA BIOS

01 CPU flags
02 CPU registers
03 Initialize DMA, PIC, PIT
04 Memory refresh
05 Keyboard initialization
06 ROM checksum
07 CMOS, battery
08 256K memory
09 Cache
0A Set Interrupt table
0B CMOS checksum
0C Keyboard initialization
0D Video adapter
0E Video memory
0F DMA channel 0
10 DMA channel 1
11 DMA page register
14 Timer chip
15 PIC controller 1
16 PIC controller 0
17 PIC stuck bits
18 PIC maskable IRQ's
19 NMI bit check
1F CMOS XRAM
20 Slot 0
21 Slot 1
22 Slot 2
23 Slot 3
24 Slot 4
25 Slot 5
26 Slot 6
27 Slot 7
28 Slot 8
29 Slot 9
2A Slot 10
2B Slot 11
2C Slot 12
2D Slot 13
2E Slot 14
2F Slot 15
30 Memory size 256K
31 Memory test over 256K
32 EISA memory
3C CMOS setup
3D Mouse/adapter, CMOS
3E Cache RAM
3F Shadow RAM
41 Floppy drive
42 Hard drive
43 RS232 parallel
45 NPU
47 Speed
4E Manufacturing loop
4F Security
50 CMOS update
51 Enable NMI, cache
52 Adapter ROM's
53 Set time
60 Virus protection setup
61 Boot speed
62 Numlock setup
63 Boot
B0 NMI in protected
B1 Disable NMI
BE Chipset default initialization
BF Chipset program
C0 Cache on/off
C1 Memory size
C2 Base 256K test
C3 DRAM page select
C4 Video switch
C5 Shadow RAM
C6 Cache program
C8 Speed switch
C9 Shadow RAM
CA OEM chipset
FF Boot

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AWARD ISA/EISA BIOS Version 4.0

01 CPU flags tested; Processor test #1
02 CPU registers tested; Processor test #2; Verify all CPU registers except SS, SP, BP with data patterns 00 and FF
03 Initialize DMA, PIC, PIT; Calculate BIOS EPROM and sign on message checksum (fail if not 0)
04 Memory refresh initialized; Test CMOS RAM interface
05 Keyboard initialization; Initialize NMI, PIE, AIE, UEI, SQWV; Disable video, parity checking and DMA; Math coprocessor reset; Clear all page registers and CMOS RAM shutdown byte; Initialize timers 0, 1, 2 and set EISA timer to a known state; Initialize DMA controllers 0 and 1; Initialize interrupt controllers 0 and 1; Initialize EISA extended registers
06 ROM checksum; Memory refresh tested
07 Low memory setup; Initialize chipset and test the presence of memory; OEM chipset initialization; Lower 256K of memory cleared; Enable parity checking and test parity in lower 256K memory
08 Setup Interrupt vector table; Initialize the first 120 Interrupt vectors with SPURIOUS_INT_HDLR and initialize INT 00-1F according to INT_TBL
09 Cache; CMOS checksum tested
0A Set interrupt table; Initialize keyboard; Detect keyboard controller
0B CMOS checksum; Video interface initialized
0C Keyboard initialization; Video memory tested
0D Video adapter initialized; OEM specific initializations
0E Reserved
0F DMA channel 0 tested with AA, 55, FF, 00 bit patterns
10 DMA channel 1 tested with AA, 55, FF, 00 bit patterns
11 DMA page register tested
12 Reserved
13 Reserved
14 Timer chip 8254 PIT timer 0 counter 2 tested
15 Verify 8259 PIC channel 1
16 Verify 8259 PIC channel 2
17 8259 PIC stuck bits tested; Turn Interrupt bits off and verify  no Interrupt mask register is on
18 8259 PIC maskable IRQ's tested
19 NMI bit check tested and parity I/O checked
1A Reserved
1B Reserved
1C Reserved
1D Reserved
1E Reserved
1F CMOS XRAM checked for
20 Slot 0 EISA initialized and enabled
21 Slot 1 EISA initialized and enabled
22 Slot 2 EISA initialized and enabled
23 Slot 3 EISA initialized and enabled
24 Slot 4 EISA initialized and enabled
25 Slot 5 EISA initialized and enabled
26 Slot 6 EISA initialized and enabled
27 Slot 7 EISA initialized and enabled
28 Slot 8 EISA initialized and enabled
29 Slot 9 EISA initialized and enabled
2A Slot 10 EISA initialized and enabled
2B Slot 11 EISA initialized and enabled
2C Slot 12 EISA initialized and enabled
2D Slot 13 EISA initialized and enabled
2E Slot 14 EISA initialized and enabled
2F Slot 15 EISA initialized and enabled
30 Memory size below 256K
31 Memory test over 256K
32 EISA memory tested found during slot initialization
3C CMOS setup; Enter protected mode
3D Mouse/adapter, CMOS
3E Cache RAM
3F Shadow RAM
41 Initialize floppy drive
42 Initialize hard drive
43 RS232 parallel
45 NPU
47 Speed for boot set
4E Manufacturing loop; display any soft errors
4F Security; ask for password if security is enabled
50 CMOS update
51 Enable NMI, cache memory
52 Adapter ROM's from C8000h to EFFFFH or F7FFFh initialized
53 Set time value for address 40 of BIOS
60 Virus protection setup
61 Boot speed
62 Numlock setup
63 Boot from Int 19
B0 NMI in protected
B1 Disable NMI
BE Chipset default initialization
BF Chipset program; initialization of system specific chipsets
C0 Cache on/off
C1 Memory size checked
C2 Base 256K tested
C3 DRAM page select tested
C4 Video switch
C5 Shadow RAM tested
C6 Cache program; configure cache memory
C8 Speed switch
C9 Shadow RAM tested
CA OEM chipset initialized
FF Boot from Int 19

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AWARD PnP BIOS

01 Reserved
02 Reserved
03 Initialize EISA registers (EISA BIOS only)
04 Reserved
05 Keyboard controller self-tested
06 Reserved
07 Verify CMOS Read/Write
09 OEM specific initialization; Configure Cyrix CPU register
0A Issue CPU ID instruction; Initialize the first 32 interrupt vectors, initialize Int.'s 33 to 120, power management initialization
0B PnP initialization; verify the RTC time, detect bad battery, read the CMOS data into the BIOS stack area, assign I/O and memory for any PCI devices
0C Initialization of BIOS data area
0D Program some of chipset's value; Measure the CPU for display, initialize the video
0E Initialize APIC (multiprocessor BIOS only); Show startup screen message
0F DMA channel 0 tested
10 DMA channel 1 tested
11 DMA page registers tested
12 Reserved
13 Reserved
14 Test 8254 0 counter 2
15 Test 8259 interrupt mask bit for channel 1
16 Test 8259 interrupt mask bit for channel 2
17 Reserved
19 Test 8259 functionality
1A Reserved
1B Reserved
1C Reserved
1D Reserved
1E If an EISA NVM
1F-29 Reserved
30 Get size of base and extended memory
31 Test base and extended memory, Test base memory from 256K to 640K , test extended memory above 1MB
32 Test all on-board super I/O ports
33 Reserved
3A Reserved
3B Reserved
3C Set flag to allow CMOS setup utility
3D Install PS/2 mouse
3E Try to turn on level 2
3F Reserved
40 Reserved
41 Initialize floppy drive controller
42 Initialize hard drive controller
43 Initialize serial & parallel ports (PnP BIOS only)
45 Initialize math coprocessor
46-4D Reserved
4E Show all error messages on screen
4F Ask for password, if needed
50 Write all CMOS values located in the BIOS stack back to CMOS
51 Reserved
52 Initialize all ISA ROM's; PCI initializations (PCI BIOS only), PnP initialization (PnP BIOS Only), setup shadow RAM, initialize power management
53 If not PnP BIOS, initialize ports; Initialize time in BIOS data area
54-5F Reserved
60 Setup virus protection for the boot sector
61 Try to turn on level 2 cache
62 program numlock & typematic speed
63 Boot system via Int 19h
B0 Unexpected interrupt in protected mode
B1 Unclaimed NMI occurred
BE Program defaults into chipset
BF Program remaining chipset values
C0 Init. all standard devices with defaults
C1 Auto detect on-board DRAM & cache
C3 Test first 26K DRAM
C5 Copy ROM BIOS to E000-FFFF
FF System booting

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AWARD Elite (Version 4.51PG) BIOS

01 Processor test; Processor status verification
02 Processor test 2; Read/Write and verify all CPU registers
03 Initialize chips; Disable NMI, PIE, AIE, UEI, SQWV.  Disable video, parity checking, DMA.  Reset math coprocessor.  Clear all page registers and CMOS shutdown.  Initialize DMA controller 0 and 1.  Initialize interrupt controllers 0 and 1.
04 Test memory refresh toggle
05 Blank video, initialize keyboard; Keyboard controller initialization
07 Test CMOS interface and battery
08 Set up low memory; Early chipset initialization, memory presence test, OEM chipset routines, clear low 64K memory, test first 64K memory
09 Early cache initialization; Cyrix CPU specific, CPU and cache initialization
0A Set up interrupt vector table; Initialize first 120 interrupt vectors
0B Test CMOS RAM checksum
0C Initialize keyboard; Detect the type of keyboard controller
0D Initialize video interface; Detect CPU clock, read CMOS location 14h to find the type of video in use, detect and initialize video adapter
0E Test video memory; Write sign-on message to screen, setup shadow RAM
0F Test DMA controller 0; BIOS checksum test, keyboard detect and initialization
10 Test DMA controller 1
11 Test DMA page registers
12-13 Reserved
14 Test timer counter 2
15 Test 8259-1 mask bits
16 Test 8259-2 mask bits
17 Test stuck 8259 interrupt bits; Test stuck key
18 Test 8259 interrupt functionality
19 Test stuck NMI bits (parity I/O check)
1A Benchmark; Display CPU clock
1B-1E Reserved
1F Set EISA mode; If the EISA memory checksum is good then EISA is initialized.  If it's not good then ISA tests and clear EISA mode flag
20 Enable slot 0; System board
21-2F Enable slots 1-15
30 Size base and extended memory; Size the base memory from 256K to 640K and the extended memory above 1MB
31 Test base and extended memory; Test the base memory from 256K to 640K and the extended memory above 1MB using various bit patterns
32 Test EISA extended memory
33-3B Reserved
3C Setup enabled
3D Initialize and install mouse if present
3E Setup cache controller
40 Display virus protect disable or enable
41 Initialize floppy
42 Initialize hard drive
43 Detect & Init. serial & parallel ports
44 Reserved
45 Detect and Init. math coprocessor
46 Reserved
47 Reserved
48-4D Reserved
4E Mfg. POST loop, or display messages
4F Security password
50 Write CMOS; Write CMOS back to RAM and clear screen
51 Pre-boot enable; Enable parity checking, enable NMI, enable cache before boot
52 Initialize option ROM's; Initialize and ROM's present at locations C800h to EFFFFh
53 Initialize time value
60 Setup virus protect
61 Set boot speed
62 Setup numlock
63 Boot attempt
B0 Spurious
B1 Unclaimed NMI
BE Chipset default initialization; Program chipset registers and power-on BIOS defaults.
BF Chipset initialization; Reserved
C0 Turn off chipset cache
C1 Memory presence test; OEM specific, test the size of on-board memory
C5 Early shadow; OEM specific, early shadow enable for fast boot
C6 Cache presence test; External cache-size detection test
E1-EF Setup pages
FF Boot loader

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AWARD Version 6.0 (i810)

CFh Test CMOS read/write functionality
C0h Early chipset initialization:   Disable shadow RAM, L2 cache (socket 7 and below), program basic chipset registers
C1h Detect memory:  Auto detection of DRAM size, type and ECC, auto detection of L2 cache (socket 7 and below)
C3h Expand compressed BIOS code to DRAM
C5h Call chipset hook to copy BIOS back to E000 & F000 shadow RAM
01h Expand the Xgroup codes located in physical memory address 1000:0
02h Reserved
03h Initial Superio_Early_Init switch
04h Reserved
05h Blank out screen; Clear CMOS error flag
06h Reserved
07h Clear 8042 interface; Initialize 8042 self test
08h Test special keyboard controller for Winbond 977 series Super I/O chips; Enable keyboard interface
09h Reserved
0Ah Disable PS/2 mouse interface (optional); Auto detect ports for keyboard & mouse followed by a port & interface swap (optional); Reset keyboard for Winbond 977 series Super I/O chips
0Bh Reserved
0Ch Reserved
0Dh Reserved
0Eh Test F000h segment shadow to see whether it is read/write capable or not.  If test fails, keep beeping the speaker
0Fh Reserved
10h Auto detect flash type to load appropriate flash read/write codes into the run time area in F000 for ESCD & DMI support
11h Reserved
12h Use walking 1's algorithm to check out interface in CMOS circuitry.  Also set real time clock power status and then check for overrride
13h Reserved
14h Program chipset default values into chipset.  Chipset default values are MODBINable by OEM customers
15h Reserved
16h Initial Early_Init_Onboard_Generator switch
17h Reserved
18h Detect CPU information including brand, SMI type (Cyrix or Intel) and CPU level (586 or 686)
19h Reserved
1Ah Reserved
1Bh Initial interrupts vector table.   If no special specified, all H/W interrupts are directed to SPURIOUS_INT_HDLR & S/W interrupts to SPURIOUS_soft_HDLR
1Ch Reserved
1Dh Initial EARLY_PM_INIT switch
1Eh Reserved
1Fh Load keyboard matrix (notebook platform)
20h Reserved
21h HPM initialization (notebook platform)
22h Reserved
23h Check validity of RTC value; Load CMOS settings into BIOS stack.  If CMOS checksum fails, use default value instead; Prepare BIOS resource map for PCI & PnP use.  If ESCD is valid, take into consideration of the ESCD's legacy information; Onboard clock generator initialization.  Disable respective clock resource to empty PCI & DIMM slots; Early PCI initialization - Enumerate PCI bus number, assign memory & I/O resource, search for a valid VGA device & VGA BIOS, and put it into C000:0
24h Reserved
25h Reserved
26h Reserved
27h Initialize INT 09 buffer
28h Reserved
29h Program CPU internal MTRR (P6 & PII) for 0-640K memory address; Initialize the APIC for Pentium class CPU; Program early chipset according to CMOS setup; Measure CPU speed; Invoke video BIOS
2Ah Reserved
2Bh Reserved
2Ch Reserved
2Dh Initialize multilanguage; Put information on screen display, including Award title, CPU type, CPU speed, etc...
2Eh Reserved
2Fh Reserved
30h Reserved
31h Reserved
32h Reserved
33h Reset keyboard except Winbond 977 series Super I/O chips
34h Reserved
35h Reserved
36h Reserved
37h Reserved
38h Reserved
39h Reserved
3Ah Reserved
3Bh Reserved
3Ch Test 8254
3Dh Reserved
3Eh Test 8259 interrupt mask bits for channel 1
3Fh Reserved
40h Test 9259 interrupt mask bits for channel 2
41h Reserved
42h Reserved
43h Test 8259 functionality
44h Reserved
45h Reserved
46h Reserved
47h Initialize EISA slot
48h Reserved
49h Calculate total memory by testing the last double last word of each 64K page; Program writes allocation for AMD K5 CPU
4Ah Reserved
4Bh Reserved
4Ch Reserved
4Dh Reserved
4Eh Program MTRR of M1 CPU; initialize L2 cache for P6 class CPU & program cacheable range; Initialize the APIC for P6 class CPU; On MP platform, adjust the cacheable range to smaller one in case the cacheable ranges between each CPU are not identical
4Fh reserved
50h Initialize USB
51h Reserved
52h Test all memory (clear all extended memory to 0)
53h Reserved
54h Reserved
55h Display number of processors (multi-processor platform)
56h Reserved
57h Display PnP logo; Early ISA PnP initialization and assign CSN to every ISA PnP device
58h Reserved
59h Initialize the combined Trend Anti-Virus code
5Ah Reserved
5Bh Show message for entering AWDFLASH.EXE from FDD (optional feature)
5Ch Reserved
5Dh Initialize Init_Onboard_Super_IO switch; Initialize Init_Onboard_AUDIO switch
5Eh Reserved
5Fh Reserved
60h Okay to enter Setup utility
61h Reserved
62h Reserved
63h Reserved
64h Reserved
65h Initialize PS/2 mouse
66h Reserved
67h Prepare memory size information for function call: INT 15h ax=E820h
68h Reserved
69h Turn on L2 cache
6Ah Reserved
6Bh Program chipset registers according to items described in Setup & Auto-Configuration table
6Ch Reserved
6Dh Assign resources to all ISA PnP devices; Auto assign ports to onboard COM ports if the corresponding item in Setup is set to "AUTO"
6Eh Reserved
6Fh Initialize floppy controller; Setup floppy related fields in 40:hardware
70h Reserved
71h Reserved
72h Reserved
73h Enter AWDFLASH.EXE if: AWDFLASH.EXE is found in floppy dive and ALT+F2 is pressed
74h Reserved
75h Detect and install all IDE devices: HDD, LS120, ZIP, CDROM...
76h Reserved
77h Detect serial ports and parallel ports
78h Reserved
79h Reserved
7Ah Detect and install coprocessor
7Bh Reserved
7Ch Reserved
7Dh Reserved
7Eh Reserved
7Fh Switch back to text mode if full screen logo is supported: if errors occur, report errors & wait for keys, if no errors occur or F1 key is pressed continue - Clear EPA or customization logo
80h Reserved
81h Reserved
82H Call chipset power management hook: Recover the text fond used by EPA logo (not for full screen logo), If password is set, ask for password
83H Save all data in stack back to CMOS
84h Initialize ISA PnP boot devices
85h Final USB initialization; NET PC: Build SYSID structure; Switch screen back to text mode; Set up ACPI table at top of memory; Invoke ISA adapter ROM's; Assign IRQ's to PCI devices; Initialize APM; Clear noise of IRQ's
86h Reserved
87h Reserved
88h Reserved
89h Reserved
90h Reserved
91h Reserved
92h Reserved
93h Read HDD boot sector information for Trend Anti-Virus code
94h Enable L2 cache; Program boot up speed; Chipset final initialization; Power management final initialization; Clear screen and display summary table; Program K^ write allocation; Program P6 class write combining
95h Program daylight saving; Update keyboard LED and typematic rate
96h Build MP table; Build and update ESCD; Set CMOS century to 20h or 19h; Load CMOS time into DOS timer tick; Build MSIRQ routing table
FFh Boot attempt (INT 19h)

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ALR BIOS POST Codes

 
01 CPU register test in progress
02 Real-time clock write/read failure
03 ROM BIOS checksum failure
04 Programmable internal timer failure (or no video card present)
05 DMA initialization failure
06 DMA page register write/read failure
08 RAM-refresh verification failure
09 1st 64KB RAM test in progress
0A 1st 64KB RAM chip or data line multi-bit failure
0B 1st 64KB RAM odd/even logic failure
0C Address line failure 1st 64KB RAM
0D Parity failure 1st 64KB RAM
10-1F bit 0-15 64KB RAM failure
20 Slave DMA-register failure
21 Master DMA-register failure
22 Master-interrupt mask-register failure
23 Slave-interrupt mask-register failure
25 Interrupt vector loading in progress
27 Keyboard-controller test failure
28 RTC power failure and checksum calculation in progress
29 Real-time clock-configuration validation in progress
2B Screen-memory test failure
2C Screen-initialization failure
2D Screen-retrace test failure
2E Search believed operational on screen believed running with video ROM
30 Monochrome display believed operable
32 Color display (40 column) believed operable
33 Color display (80 column) believed operable
 
 


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BIOS Beep Codes

When a PC starts up, the first thing it does is run a power-on Self Test (POST) to test the computers hardware. If it detects an error, you will be notified by either a number of audio beeps or an error message on the screen. This page was created to explain what these error messages or audio beeps mean.
INFO HERE

BIOS Utilities


 

 


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Chips and Technologies BIOS POST Codes

 

Some are sent to the display in decimal as well as port address 80h.  Micro Channel BIOS's use port 680 and 3BC.

Chips & Technologies Post Procedures:

Power on tests CPU synchronizes with clock.  Check the CPU or clock if a failure occurs
System ROM Check The BIOS runs a checksum on itself.   Check the BIOS chips if a failure occurs
DMA controller Fail DMA controllers are initialized and tested.  Check the DMA chips if a failure occurs
System Timer Failed Channels 0, 1, and 2 are tested in sequence.  If a failure occurs, check the PIT chips
Base 64K Memory Testing Walking bit test performed on first 64K of RAM which is critical for the BIOS vector area to be initialized.  Check for bad RAM chips or a bad data or address line
Interrupt Controller Failed Test the 8259 chip
CPU Still In Protected Mode Attempts are made to read the configuration of the system through the 8042 keyboard controller
Refresh Not Occurring Memory refresh is tested; standard refresh is 120-140ns.  Check the PIT if a failure occurs
Keyboard Controller Not Responding Tests are run on the keyboard controller.  the the KBC 8042 if a failure occurs
Could Not Enter Protected Mode BIOS attempts to enter protected mode to test extended memory.  Check the 8042 KBC chip or the A20 gate address line if a failure occurs
Initialize Timer Attempts are made to initialize the PIT
Initialize DMA Controller Attempts are made to initialize the DMA controllers
Entering/Exiting Protected Mode The translation is handled by the keyboard controller and the A20 gate address line.  Check the keyboard controller if a failure occurs
Relocate Shadow RAM BIOS attempts to shadow itself into extended memory.  Check for memory problems if a failure occurs
Test For EMS Check for EMS adapter or an improper CMOS setting/Jumper setting if a failure occurs
Test Video Capabilities Normally includes a memory test on the adapter memory up to 256K
Test Memory Extensive testing of Base, Extended,and Expanded memory.  Check for defective memory modules, 8042 KBC, A20 gate address line or an improper CMOS and/or jumper setting
Check System Options The hardware in the system is compared with the values stored in CMOS.  The PIT, PIC, 8042 KBC, RTC and other system board components are tested again
Peripheral Check and test Checks are made for the peripherals at standard I/O ports including serial and parallel ports, keyboards, and math coprocessor.   You should see an error message on screen at the point if a failure occurs
Floppy Test Floppy devices set in CMOS are checked and initialized.  If a bootable floppy is found the fixed disks are tested and the BIOS will boot to the floppy disk.  Check for defective controllers or an improper CMOS Setup if a failure occurs
Fixed Disk Test Checks for fixed disks in CMOS.  If no bootable floppy in the A: drive, then the BIOS loads the first sector off the first fixed disk and jumps to the area of memory where the sector was loaded.  You may just see a flashing cursor or an error message from the potential operating system.  Check for improper CMOS Setup, defective controller, or fixed disk failure.  Also, check for a corrupt bootloader on the fixed disk
Advanced Options These include the mouse, cache, etc..   you should see an error message on the screen at this point, except that a defective cache may hang the system.  In most cases, the cache will be disabled by the BIOS

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Chips & Technologies BIOS Post Codes

00 Error in POS register
01 CPU flag register failed
02 CPU register test failed
03 BIOS ROM checksum failed
04 DMA controller test failed
05 System timer IC failed
06 Base 64K RAM failed address test: not installed, misconfigured, or bad addressing
07 Base 64K RAM failed data test
08 Interrupt controller failed
09 Hot (unexpected) interrupt occurred
0A System timer does not interrupt
0B CPU still in protected mode
0C DMA page registers failed
0D Refresh not occurring
0E Keyboard controller not responding
0F Could not enter protected mode
10 GDT or IDT failed, Keyboard controller failed
11 LDT register failed, Keyboard controller failed
12 Task register failed, Keyboard controller failed
13 LSL instruction failed, keyboard controller failed
14 LAR register failed, Keyboard controller failed
15 VERR/VERW failed, Keyboard controller failed
16 Keyboard controller gate A20 failed
17 Exception failed/unexpected exception
18 Shutdown during memory test
19 Last used error code
1A Copyright checksum error
1B Shutdown during memory sizing
1C Chipset initialization
50 Initialize hardware
51 Initialize timer
52 Initialize DMA controller
53 Initialize 8259 programmable interrupt controller
54 Initialize system chipset
55 Setup EMS configuration
56 Entering protected mode for first time
57 Size memory chips
58 Configure memory chip interleave
59 Exiting protected mode for first time
5A Determine system board memory size
5B Relocate shadow RAM
5C Configure EMS
5D Set up wait state configuration
5E Re-test 64K RAM
5F Test shadow RAM
60 Test CMOS RAM
61 Test video
62 Test and initialize DDNIL bits
63 Test protected mode interrupt
64 Test address line A20
65 Test memory address lines
66 Test memory
67 Test extended memory
68 Test timer interrupt
69 Test real time clock (RTC)
6A Test keyboard
6B Test 80x87 math chip
6C Test RS232 serial ports
6D Test parallel ports
6E Test dual card
6F Test floppy drive controller
70 Test hard drive controller
71 Test keylock
72 Test pointing device
90 Setup RAM
91 Calculate CPU speed
92 Check configuration
93 Initialize BIOS
94 POST Bootstrap
95 Reset IC's
96 PEAK: System board POS.   NEAT/OC8291 ELEAT: Test /initialize cache RAM and controller.
97 VGA power on diagnostics and setup
98 Adapter BIOS
99 Re-initialize DDNIL bits
A0 Exception 0
A1 Exception 1
A2 Exception 2
A3 Exception 3
A4 Exception 4
A5 Exception 5
A6 Exception 6
A7 Exception 7
A8 Exception 8
A9 Exception 9
AA Exception A
AB Exception B
AC Exception C
AD Exception D
C0 System board memory failure
C1 I/O channel check activated
C2 Watchdog timer timeout
C3 Bus timer timeout

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Original IBM Beep Codes
 
 

Compaq BIOS Beep Codes

Beeps

Error Message

Description

1 short No error System is booting properly
1 long, 1 short BIOS ROM checksum error The contents of the BIOS ROM to not match the expected contents.  If possible, reload the BIOS from the PAQ
2 short General error Unknown
1 long, 2 short Video error Check the video adapter and ensure it's seated properly.  If possible, replace the video adapter
7 beeps (1 long, 1s, 1l, 1 short, pause, 1 long, 1 short, 1 short AGP video The AGP video card is faulty.   Reseat the card or replace it outright.  This beep pertains to Compaq Deskpro systems
1 long neverending beep  

Memory error. Bad RAM. Replace and test

1 short, 2 long Bad RAM Reseat RAM then retest; replace RAM if failure continues

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Compaq BIOS POST Codes

 


Compaq General BIOS Post Codes:

00 Initialize flags, MSW,IDTLIN
01 Read manufacturing jumper
02 8042 received read command
03 No response from 8042
04 Look for ROM at E000
05 Look for ROM at C800
06 Normal CMOS reset code
08 Initialize 8259,80287
09 Reset code in CMOS byte
0A Vector vis 40:67 reset function
0B Vector vis 40:67 with E01 function
0C Boot reset function
0D Test #2 8254 PIT counter 0
0E Test #2 8254 PIT counter 2
0F Warm boot
10 PPI disabled, test 8254 PIT's 0 and 1
11 Initialize (blast) VDU controller
12 Clear screen; turn ON video
13 Test time 0
14 Disable RTC interrupts
15 Check battery power
16 Battery has lost power
17 Clear CMOS Diags.
18 Test base memory (First 128K)
19 Initialize base memory
1A Initialize VDU adapters
1B The system ROM
1C CMOS checksum
1D DMA controller/page registers
1E Test keyboard controller
1F Test 286 protected mode
20 Test real and extended memory
21 Initialize time-of-day
22 Initialize 287 coprocessor
23 Test the keyboard and 8042
24 Reset A20, set default CPU speed
25 Test diskette subsystem
26 Test fixed disk subsystem
27 Initialize parallel printer
28 Perform search for optional ROM's
29 Test valid system configuration
2A Clear screen
2B Check for invalid time and date
2C Optional ROM search
2D Test timer 2
2F Write to diagnostic byte
30 Clear first 128K bytes of RAM
31 Load interrupt vectors 70-77
32 Load interrupt vectors 00-1F
33 Initialize MEMSIZE and RESETWD
34 Verify CMOS checksum
35 CMOS checksum is not valid
36 Check battery power
37 Check for game adapters
38 Check for Serial ports
39 Check for parallel printer ports
3A Initialize port and comm time-outs
3B Flush keyboard buffer
40 Save RESETWD value
41 Check RAM refresh
42 Start write of 128K RAM test
43 Reset parity checks
44 Start verify of 128K RAM test
45 Check for parity errors
46 NO RAM errors
47 RAM error detected
50 Check for dual frequency in CMOS
51 Check CMOS VDU configuration
52 Start VDU ROM search
53 Vector to VDU option ROM's
54 Initialize first display adapter
55 Initialize second display adapter
56 No display adapters installed
57 Initialize primary VDU mode
58 Start of VDU test (each adapter)
59 Check existence of adapter
5A Check VDU registers
5B Start screen memory test
5C End test of adapter, clear memory
5D Error detected on an adapter
5E Test the next adapter
5F All adapters successfully tested
60 Start of memory tests
61 Enter protected mode
62 Start memory sizing
63 Get CMOS size
64 Start test of real memory
65 Start test of extended memory
66 Save size memory (base, ext)
67 128K-option installed CMOS bit
68 Prepare to return to real mode
69 Back in real mode-successful
6A Protected mode error during test
6B Display error message
6C End of memory test
6D Initialize KB OK string
6E Determine size to test
6F Start MEMTEST
70 Display XXXXXKB OK
71 Test each RAM segment
72 High order address test
73 Exit MEMTEST
74 Parity error on bus
75 Start protected mode test
76 Prepare to enter protected mode
77 Test software exceptions
78 Prepare to return to real mode
79 Back in real mode-successful
7A Back in real mode-error occurred
7B Exit protected mode
7C High order address test failure
7D Entered cache controller test
7E Programming memory cache
7F Copy system ROM to high RAM
80 Start of 8042 test
81 Do 8042 self test
82 Check result received
83 Error result
84 OK 8042, Init mode=5D
86 Start test, reset keyboard
87 Got acknowledge, read result
88 Got result, check it
89 Test for stuck keys
8B Test keyboard interface
8A Key seems to be stuck
8C Got result, check it
8D End of test, no errors
90 Start of CMOS test
91 CMOS seems to be OK
92 Error on CMOS read,write test
93 Start of DMA controller test
94 Page registers seem to be OK
95 DMA controller is OK
96 8237 initialization is complete
97 Start of NCA RAM test
A0 Start of diskette tests
A1 FDC reset active (3F2h Bit 2)
A2 FDC reset inactive (3F2h Bit 2)
A3 FDC motor on
A4 FDC time-out error
A5 FDC failed reset
A6 FDC passed reset
A8 Start to determine drive type
A9 Seek operation initialized
AA Waiting for FDC seek status
AF Diskette tests complete
B0 Start of fixed drive tests
B1 Combo board not found-exit
B2 Combo controller failed-exit
B3 Testing drive 1
B4 Testing drive 2
B5 Drive error (error condition)
B6 Drive failed (failed to respond)
B7 No fixed drives-exit
B8 Fixed drive tests complete
B9 Attempt to boot diskette
BA Attempt to boot fixed drive
BB Boot attempt failed FD/HD
BC Jump to boot record
BD Drive error, retry booting
BE Weitek coprocessor test
D0 Entry to clear memory routine
D1 Ready to go to protected mode
D2 Ready to clear extended memory
D3 Ready to reset back to real mode
D4 Back in real mode
D5 Clear base memory
DD Built-in self-test failed
E0 Ready to replace E000 ROM
E1 Completed E000 ROM replacement
E2 Ready to replace EGA ROM
E3 Completes EGA ROM replacement

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Compaq 286 Deskpro BIOS Post Codes

01 Central processing unit
02 Coprocessor
02 Direct memory access
04 Interrupt controller
05 Port 61
06 Keyboard controller
07 CMOS
08 CMOS
09 CMOS
10 Programmable timer
11 Refresh detect test
12 Speed test
14 Speaker test
21 Memory read/write
24 Memory address
25 Walking I/O
31 Keyboard short test
32 Keyboard long test
33 Keyboard LED test
35 Security lock test
41 Printer failed
42 Printer date, interrupt
43 Printer pattern test
48 Printer failed
51 VDU controller test
52 VDU controller test
53 VDU attribute test
54 VDU character set test
55 VDU 80 x 25 mode
56 VDU 80 x 25 mode
57 VDU 40 x 25 mode
60 Diskette drive ID test
61 Format
62 Read test
63 Write/read compare test
64 Random seek
65 ID media test
66 Speed test
67 Wrap test
68 Write protect test
69 Reset controller test

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Compaq 386 Deskpro BIOS Post Codes

01 I/O ROM error
02 System memory board failure
12 System option error
13 Time and date not set
14 Memory size error
21 Memory error
23 Memory address error
25 Memory error
26 Keyboard error
33 Keyboard controller error
34 Keyboard or system unit error
41 Printer error
42 Monochrome adapter failure
51 Display adapter failure
61 Diskette controller failure
62 Diskette boot recorder error
65 Ext. FDC failed got to internal F
6A Floppy port address conflict
6B Floppy port address conflict
72 Coprocessor detection

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Compaq 486 Deskpro BIOS Post Codes

01 CPU test failed
02 Coprocessor or Weitek error
03 DMA page registers
04 Interrupt controller master
05 Port 61 error
06 Keyboard controller self test
07 CMOS RAM test failed
08 CMOS interrupt test failed
09 CMOS clock load data test
10 Programmable timer
11 Refresh detect test failed
12 Speed test slow mode out of range
13 Protected mode test failed
14 Speaker test failed
16 Cache memory configuration
19 Installed devices test
21 Memory machine ID test failed
22 Memory system ROM checksum
23 Memory read/write test failed
24 Memory address test failed
25 Walking I/O test failed
26 Increment pattern test failed
31 Keyboard short test, 8042
32 Keyboard long test failed
33 Keyboard LED test, 8042
34 Keyboard typematic test failed
41 Printer failed or not connected
42 Printer data register failed
43 Printer pattern test
48 Printer not connected
51 Video controller test failed
52 Video memory test failed
53 Video attribute test failed
54 Video character set test failed
55 Video 80 x 25 mode
56 Video 80 x 25 mode
57 Video 40 x 25 mode test failed
58 Video 320 x 200 mode color set 1
59 Video 320 x 200 mode color set 1
60 Diskette ID drive types test
61 Diskette format failed
62 Diskette read test failed
63 Diskette write, read, random seek
65 Diskette media ID failed
66 Diskette speed test failed
67 Diskette wrap test failed
68 Diskette write protect test
69 Diskette reset controller test
82 Video memory test failed
84 Video adapter test failed

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Compaq Video BIOS Post Codes

00 Entry into video ROM
01 Test alternate adapters
02 Perform vertical sync tests
03 Perform horizontal sync tests
04 Perform static system tests
05 Perform bug tests
06 Peform configuration tests
07 Perform alternate ROM tests
08 Run color gun off tests
09 Run color gun on tests
0A Test video memory
0B Check that adapter board is present
10 Error...illegal configuration
20 Error...no vertical sync present
21 Error...vertical sync out of range
30 Error...no horizontal sync present
40 Error...color register failure
50 Error...slot type conflict failure
51 Error...video memory conflict error
52 Error...ROM conflict error
60 Error...red DAC stuck low
61 Error...green DAC stuck low
62 Error...blue DAC stuck low
63 Error...DAC stuck high
64 Error...red DAC fault
65 Error...green DAC fault
66 Error...blue DAC fault
70 Error...bad alternate ROM version
80 Error...color gun stuck on
90 Error...color gun stuck off
A0 Error...video memory failure
F0 Error...equipment failure
00 Video POSY complete

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Compaq System Post Messages

101 Option ROM Error
102 System board failure
103 System board failure
162 System options not set
163 Time and date not set
164 Memory size error
183 Invalid processor jumper setting
201 Memory error
202 Memory type mismatch
207 ECC corrected single bit errors in DIMM/SIMM pair(s)
213 Incompatible DIMM module in DIMM socket(s)
301 Keyboard error
304 Keyboard or system unit error
401 Parallel port 1 address assignment conflict
403 Parallel port 3 address assignment conflict
404 Parallel port address conflict detected
410 Audio interrupt conflict
411 Network interface card interrupt conflict
501 Display adapter failure
601 Diskette controller error
602 Diskette boot record error
605 Diskette drive type error
610 External storage device failure
611 Primary floppy port address assignment conflict
612 Secondary floppy port address assignment conflict
660 Display cache is detected unreliable
912 Computer cover has been removed since last system startup
914 Hood lock coil is not connected
916 thermal sensor from processor heatsink is not connected
917 Expansion riser not detected
1151 Serial port 1 address conflict detected
1152 Serial port 2 address conflict detected
1155 Serial port address detected
1201 System audio address conflict detected
1202 MIDI port address conflict detected
1203 Game port address conflict detected
1720 SMART hard drive detects imminent failure
1721 SMART SCSI hard drive detects imminent failure
1771 Primary disk port address assignment conflict
1772 Secondary disk port address assignment conflict
1780 Disk 0 failure
1781 Disk 1 failure
1782 Disk controller failure
1790 Disk 0 failure
1791 Disk 1 failure
1792 Secondary disk controller failure
1793 Secondary controller or disk failure
1800 Temperature alert
1801 Processor not supported by ROM BIOS

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BIOS Beep Codes

When a PC starts up, the first thing it does is run a power-on Self Test (POST) to test the computers hardware. If it detects an error, you will be notified by either a number of audio beeps or an error message on the screen. This page was created to explain what these error messages or audio beeps mean.
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Dell BIOS POST Codes

 
Dell BIOS Beep Codes | Dell BIOS System Messages | Dell BIOS Post Codes

 

Dell BIOS Beep Codes

Beep Codes Possible Causes Corrective Action
1 - 2 No video card detected Reseat the video card
1 - 2 - 2 - 3 BIOS ROM checksum error  
1 - 3 - 1 - 1 DRAM refresh error Reseat the memory modules
1 - 3 - 1 - 3 8742 Keyboard Controller error Reseat the keyboard connector
1 - 3 - 3 - 1 Memory defective or not present Reseat the memory modules
1 - 3 - 4 - 1 RAM failure on line xxx Reseat the memory modules
1 - 3 - 4 - 3 RAM failure on data bits xxx of low byte on memory bus Reseat the memory modules
1 - 4 - 1 - 1 RAM failure on data bits xxx of high byte on memory bus Reseat the memory modules

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Dell BIOS System Messages

Message Possible Cause Corrective Action
nnnn Cache RAM Passed nnnn KB of system cache RAM has been successfully tested
nnnn Extended RAM Passed nnnn KB of extended RAM has been tested
nnnn Shadow RAM Passed nnnn KB of shadow RAM has been successfully tested  
nnnn System RAM Passed nnnn KB of system RAM has been successfully tested  
CD-ROM drive Identified The systems automatic drive type detection feature has identified the CD-ROM drive  
Diskette drive A error; Diskette drive B Error Drive A or B is present but has failed the BIOS POST Ensure that the drive is installed correctly in the chassis and detected correctly in the system setup
Entering Setup The system is starting the system setup program  
Extended RAM Failed at offset: nnnn Extended memory is not working correctly or is not configured correctly at offset: nnnn IF you receive this message after making changes in the system setup program, enter the program and restore the original value(s)
Failing bits: nnnn nnnn is a map of the bits at RAM address that failed the memory test.  Each 1 in the map indicates a failed bit If you receive this message after making changes in the system setup program, enter the program and restore the original value(s)
Fixed Disk n Failure; Fixed Disk Controller Failure The hard drive specified by n is not working or not configured correctly Ensure that the drive is installed correctly in the chassis and defined coracle in the system setup program
Fixed Disk n Identified The system's automatic drive type detection feature has identified the hard disk drive(s)  
Incorrect Drive x type - Run Setup Diskette drive x is not correctly identified in the system setup program Ensure that the drive is defined correctly in the system setup program
Invalid NVRAM media type The system is having a problem accessing NVRAM (CMOS) Set the configuration jumper to Maintenance mode and restart the system to return all settings to their defaults
Invalid system configuration data The system configuration information is the system setup program is incorrect, or the battery charge may be low Enter the system setup program and verify the system configuration, then restart the system
Keyboard controller error The keyboard controller failed it's test If you receive this message after making changes in the system setup program, enter the program and restore the original value(s)
Keyboard error The keyboard is not working correctly The keyboard or system board may need to be replaced
Keyboard error nn The BIOS has detected a stuck key represented by scan code nn Make sure nothing is resting on the keyboard.  If a key appears to be stuck, carefully pry it up.  if the problem persists, you may need to replace the keyboard
Mouse initialized The system's mouse has been found and initialized  
Operating system not found The operating system cannot be located on drive A or drive C Enter the system setup program and confirm that drive A or drive C is properly identified
Parity check 1 nnnn A parity error has been detected on the system bus.  The BIOS attempts to locate the address and display it nnnn.  If it cannot locate the address, it displays ???? instead If you receive this message after making changes in the setup program, enter the program and restore the original values(s)
Parity check 2 nnnn A parity error has been detected on the I/O bus.  The BIOS attempts to locate the address and display it nnnn.  If it cannot locate the address, it displays ???? instead If you receive this message after making changes in the setup program, enter the program and restore the original values(s)
Press <F1> to resume, <F2> to Setup This message is displayed after a recoverable error message Press <F1> to start the boot routine or <F2> to enter the system setup program and change any settings
Press <Del> to enter SETUP Optional message displayed during POST Id desired, press <Del> to enter the system setup program
Previous boot incomplete - Default configuration used After a unsuccessful boot, POST loads default values There may be incorrect values or incorrect settings in the system setup program.  Run the system setup program and attempt to restore the incorrect settings.  If the message reappears, set the configuration jumper to Maintenance mode and restart the system to return all settings to their defaults
Real time clock error The RTC has failed the BIOS test If you receive this message after making changes in the setup program, enter the program and restore the original values(s)
Resource allocation conflict on motherboard The system cannot configure all system board devices without a resource conflict Run the system setup program and try to resolve any obvious resource conflicts.  If the message reappears, set the configuration jumper to Maintenance mode and restart the system to return all settings to their defaults
Shadow RAM failed at offset: nnnn Shadow RAM has failed at offset nnnn in the 64KB block in which the error was detected If you receive this message after making changes in the setup program, enter the program and restore the original values(s)
System battery is dead - Replace and run SETUP The CMOS clock battery indicator shows the battery is dead Replace the battery and run the system setup program to reconfigure the system
System BIOS shadowed The system BIOS has been copied to shadow RAM  
System cache error - cache disabled RAM cache failed the BIOS test.  The BIOS has disabled the cache If you receive this message after making changes in the system setup program, enter the program and restore the original settings
System CMOS checksum bad - run SETUP System CMOS has been corrupted or modified incorrectly, perhaps by an application program that changes data stored in CMOS Run the system setup program and reconfigure the system by either reverting to the default values or by making your own selections
System RAM failed at offset: nnnn System RAM failed at offset nnnn in the 64KB block in which the error was detected If you receive this message after making changes in the setup program, enter the program and restore the original values(s)
System timer error The timer test failed If you receive this message after making changes in the setup program, enter the program and restore the original values(s)
UMB Upper limit segment address: nnnn Displays the address nnnn of the upper limit of the UMB, indicating released segments of the BIOS which may be reclaimed by a virtual memory manager  
Video BIOS shadowed The video BIOS has been successfully copied to shadow RAM  

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Dell BIOS Post Codes

01 CPU register test in progress
02 CMOS read/write test failed
03 BIOS ROM checksum bad
04 8254 programmable interrupt controller failed
05 DMA controller initialization failed
06 DMA page-register test failed
08 RAM refresh verification failed
09 Starting first-64K RAM test
0A First-64KB RAM IC or data line bad
0B First-64KB RAM odd/even logic bad
0C First-64KB address line bad
0D First-64KB parity error
10 Bit 0 bad in first 64KB
11 Bit 1 bad in first 64KB
12 Bit 2 bad in first 64KB
13 Bit 3 bad in first 64KB
14 Bit 4 bad in first 64KB
15 Bit 5 bad in first 64KB
16 Bit 6 bad in first 64KB
17 Bit 7 bad in first 64KB
18 Bit 8 bad in first 64KB
19 Bit 9 bad in first 64KB
1A Bit 10 bad in first 64KB
1B Bit 11 bad in first 64KB
1C Bit 12 bad in first 64KB
1D Bit 13 bad in first 64KB
1E Bit 14 bad in first 64KB
1F Bit 15 bad in first 64KB
20 Slave DMA register bad
21 Master DMA register bad
22 Master interrupt-mask register bad
23 Slave interrupt-mask register bad
25 Loading interrupt vectors
27 Keyboard-controller test failed
28 CMOS RAM battery bad
29 CMOS configuration validation in progress
2B Video-memory test failed
2C Video initialization failure
2D Video-retrace failure
2E Searching for a video ROM
30 Switching to video ROM
31 Monochrome operation OK
32 Color (CGA) operation OK
33 Color operation OK
34 Timer-tick interrupt in progress (or bad)
35 CMOS shutdown test in progress (or bad)
36 Gate A20 bad
37 Unexpected interrupt in protected mode
38 RAM test in progress or high address line is bad
3A Interval timer channel 2 bad
3B Time-of-day test bad
3C Serial-port test bad
3D Parallel -port test bad
3E Math co-processor test bad
3F Cache-memory test bad

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DTK BIOS POST Codes

 
01 Testing the CPU
03 Initialize the 8259 interrupt controller
05 Initialize the video board - MCA & CGA
0D Initialize the 8237 DMA controller
0E Initialize the DMA 74612 page registers
12 Test the 8042 keyboard controller
16 Test the DMA 7237 controller and 8254 programmable interrupt timer
22 Testing DRAM refresh circuitry
25 Base 64KB memory test
30 Set up system stack
33 Read-system configuration through 8042 keyboard controller
37 Test keyboard clock and data line
40 Determine video type
44 Locate and test, if present, MDA and CGA video
48 Initialize video 80 x 25 mode
4D Display DTK BIOS copyright message
4F Check serial and parallel ports
50 Check floppy disk controller
55 Check shadow RAM
58 Display total memoryand switch to real mode
5A Successful switch back to real mode
60 Check hard disk drive controller
62 Initialize floppy drive
65 Initialize hard drive
67 Initialize the floppy disk drive and the hard disk drive
6A Disable gate A20 and test math coprocessor
70 Set system date and time RTC-146918
77 Call interrupt 19 boot loader

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Eurosoft/Mylex BIOS POST Codes

 
Eurosoft/Mylex BIOS Post Codes | Eurosoft 4.71 BIOS Post Codes | Mylex BIOS Post Codes

 

Eurosoft/Mylex BIOS Post Codes

01 CPU test failed
02 DMA page register test failed
03 Keyboard controller test failed
04 BIOS ROM checksum error
05 Keyboard command test failed
06 CMOS RAM test failed
07 RAM refresh test failed
08 First-64KB memory test failed
09 DMA controller test failed
0A Initialize DMA controller
0B Interrupt test failed
0C Checking RAM size
0D Initializing video system
0E Video BIOS checksum failed
10 Search for monochrome video adapter
11 Search for color video adapter
12 Word-splitter and byte-shift test failed
13 Keyboard test failed
14 RAM test failed
15 System timer test failed
16 Initialize keyboard controller output port
17 Keyboard test failed
18 Initialize keyboard
19 Real-time clock test failed
1A Math coprocessor test failed
1B Reset floppy and hard drive controllers
1C Initialize floppy drive
1D Initialize the hard drive
1E Locate adapter ROM's from C800h to DFFFh
1F Locate and initialize serial and parallel ports
20 Initialize time of day in RTC
21 Locate adapter ROM's from E000h to EFFFh
22 Search for boot device
23 Boot from floppy disk
24 Boot from hard disk
25 Gate A20 enable/disable failure
26 Parity error
30 DDNIL bit-scan failure
FF Fatal error...system halted

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Eurosoft 4.71 BIOS Post Codes

03 DMA page registers tested
04 DMA page registers failed
05 Keyboard tested
06 Keyboard test failed
07 Keyboard self-test passed
08 Keyboard self-test failed
09 8042 keyboard controller checking links
0A 8042 keyboard controller unable to read links
0B RATMOD/DIAG link
0C Keyboard port 60h tested
0D Keyboard failed port 60h test
0E Keyboard parameter tested
0F Keyboard parameter test failed
10 Keyboard command byte read
11 Keyboard command byte failed read
12 Keyboard command byte read OK
13 Keyboard command byte corrupt
14 RAM-refresh toggle switch
15 RAM-refresh clock not correct
16 RAM bit test passed
17 RAM bit test failed
18 RAM parity tested
19 RAM parity error
1A CMOS RAM tested
1B CMOS RAM test failed
1C CMOS battery OK
1D CMOS battery failed
1E CMOS checksum passed
1F CMOS checksum failed
20 CMOS battery fault bit set
21 Master DMA controller 1 tested
21 Slave DMA controller 2 tested
22 Master DMA controller 1 failed
23 Slave DMA controller 2 failed
24 Protected mode entered successfully
25 RAM test completed
26 BIOS RAM checksum tested
27 BIOS RAM checksum test failed
28 Protected mode exit successful
29 Keyboard power-up reply received
2A Keyboard power-up reply missing
2B Keyboard disable command tested
2C Keyboard disable command failed
2D Checking for video system
2E POST errors have been reported
2F About to halt
30 Protected mode entered safely
31 RAM test complete
32 Master interrupt controller (PIC 1) tested
33 Master interrupt controller (PIC 1) failed
34 Slave interrupt controller (PIC 2) tested
35 Slave interrupt controller (PIC 2) failed
36 Chipset initialization
37 Chipset initialization failed
38 BIOS shadowing tested
39 BIOS shadowing failed
3A Video BIOS shadowing tested
3B Video BIOS shadowing failed

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Mylex BIOS Post Codes

01 CPU test
02 DMA page register tested
03 Keyboard controller tested
04 ROM BIOS checksum
05 Send keyboard command test
06 CMOS RAM test
08 RAM-refresh test
09 First-64K memory test
0A DMA controller test
0B Initialize DMA controller
0C Interrupt test
0D Determine RAM size
0E Initialize video and verify EGA or VGA checksum
10 Search for monochrome card
11 Search for color card
12 Word-splitter and byte-shifter test
13 Keyboard tested
14 RAM tested
15 System timer tested
16 Initialize keyboard-controller output port
17 Keyboard-interrupt test

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Faraday A-Tease BIOS POST Codes

 
01 CPU test failed
02 BIOS ROM checksum test failed
03 CMOS shutdown byte failed
04 Testing DMA page register
05 Testing system timer, programmable interrupt timer
06 Testing system refresh
07 testing system refresh
08 Testing lower 128KB of RAM
09 Testing video controller
0A Testing RAM 128KB to 640KB
0B Testing DMA controller #1
0C Testing DMA controller #2
0D Testing interrupt controller #1
0E Testing interrupt controler #2
0F Testing control port
10 Testing parity
11 Testing CMOS RAM checksum
12 Testing for manufacturing-mode jumper
13 Configure interrupt vectors
14 Testing the keyboard
15 Configuring parallel ports
16 Configuring serial ports
17 Configuring lower 640KB RAM
18 Configuring RAM above 1MB
19 Configuring keyboard
1A Configuring floppy drive
1B Configuring hard-disk drive
1C Configuing game-port adapter
1D Testing and initializing math co-processor
1E Checking CMOS real time clock
1F Calculate and verify CMOS RAM checksum
21 Initialize PROM drivers
22 Test parallel-port loopback
23 Test serial-port loopback
24 Test CMOS real time clock
25 Test the CMOS shutdown
26 Test memory above 1MB
80 Error...divide overflow
81 Error...single step fault
82 Error...NMI stuck on error
83 Error...breakpoint fault
84 Error...Int. 0 detect fault
85 Error...bound error
86 Error...Invalid opcode (BIOS or CPU fault)
87 Error...processor extension not available
88 Error...double-exception error
89 Error...processor extended-segment error
8A Error...invalid task state segment
8B Error...needed segement not present
8C Error...stack segment not present
8D Error...general-protection error
8E Error...general-protection error
8F Error...general-protection error
90 Error...processor-extension error
91-FF Error...spurious interrupts
F3 Error...CPU protected-mode fault
F9 Error...virtual-block move error

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HP - Hewlett Packard BIOS POST Codes

 
HP BIOS Post Procedures | HP Vectra BIOS Post Codes | HP Vectra ES BIOS Post Codes
HP Vectra QS & RS BIOS Post Codes
|
HP Pavilion Series 3100 & 8000 BIOS Post Codes

 

HP BIOS Post Procedures

CPU Registers in CPU tested with data patterns, error flags are set, verified and reset
ROM BIOS Checksum Checksums are performed on high and low BIOS chips
PIC Test Test timer channels 0-2 then the memory refresh signal.  Initialize timer if tests are passed.  Check the 8254 chip
64K Test Walking bit and address collision tests are performed on the first 64K of memory.  Check for a bad memory chip or address line
Cache Controller The the CPU cache controller and memory
Video Adapter Initialize the video adapter.  If EGA.VGA is present, wait for the adapter to finish internal diagnostics.  Check for adapter or improper setup if a failure occurs
DMA Test Bit patterns written to all DMA controller registers, including page registers, and verifies the patterns written.   If the tests pass the registers are reset and the controller initialized
PIC Test Test mask register of master and slave interrupt controllers.  Generate interrupt and monitor CPU to test success.   Failure is normally down to the PIC but the interrupt test uses the BIOS clock (interrupt) and the RTC, so check those also
Keyboard Controller Perform several tests on the 8042 keyboard controller then send a series of interrupt request commands via the 8259 PIC
HP-HIL Test Test the HP-HIL (Hardware Interrupt Level) controller with data patterns and verify it
CMOS Test Perform a checksum on the standard and extended CMOS RAM area.  Perform a register test and check byte 0D  to determine power status.  Check the CMOS extended CMOS RAM or battery respectively if a failure occurs
Manufacturing Loop Search for diagnostic tool used in manufacturing and run predetermined tests if found.  Otherwise continue POST
Base Memory Test Test RAM between 64K and 640K with several pattern test.  The bit failure and bank can be determined by the displayed hex code
Extended Memory Test Test extended memory found.  Bank and failing bit displayed by the hex code
RTC Test Test the RTC portion of the CMOS chip
Keyboard Controller Test keyboard controller.   Initialize keyboard if no errors found
Floppy Disk Test and initialize floppy controllers and drives found.  Check specific errors with the displayed hex code.  Check for correct setup or defective CMOS chip or defective battery
Math Coprocessor Test NPU registers and interrupt request functions
CPU Clock Test Test interface between CPU and system at different speeds.  Check for incorrect clock setting for system peripherals or a bad CPU or clock generator chip
Serial and Parallel Test Test and initialize serial and parallel ports.  Failure here will not halt the POST.  The Vectra RS BIOS does not test the parallel port
Boot Initialize the BIOS vector table, standard and extended CMOS data areas and any adapter ROM's present.  Then call Int 19 boot loader and give control to it.  Failures past this point usually point to the hard drive or corrupt bootloader code

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HP Vectra BIOS Post Codes

01 LED test
02 Processor test
03 System (BIOS) ROM test
04 RAM refresh timer test
05 Interrupt RAM test
06 Shadow the system ROM BIOS
07 CMOS RAM test
08 Internal cache memory test
09 Initialize the video card
10 Test external cache
11 Shadow option ROM's
12 Memory subsystem test
13 Initialize EISA/ISA hardware
14 8042 keyboard controller self test
15 Timer 0 / Timer 2 test
16 DMA subsystem test
17 Interrupt controller test
18 RAM address line independence test
19 Size extended memory
20 Real mode memory test (first 640K)
21 Shadow RAM test
22 Protected mode RAM test (extended RAM)
23 Real time clock test
24 Keyboard test
25 Mouse test
26 Hard disk test
27 LAN test
28 Flexible disk controller subsystem test
29 Internal numeric coprocessor test
30 Weitek coprocessor test
31 Clock speed switching test
32 Serial port test
33 Parallel port test

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HP Vectra ES BIOS Post Codes:

000F 80286 CPU is bad
0010 Bad checksum on ROM 0
0011 Bad checksum on ROM 1
011X One of the RTC registers is bad; Register = x(0-D)
0120 RTC failed to tick
0240 CMOS/RTC has lost power
0241 Invalid checksum, IBM CMOS area
0280 Invalid checksum, HP CMOS area
02XY One of the CMOS registers is bad; Register = XY - 40
0301 8042 failed to accept the reset command
0302 8042 failed to respond to the reset command
0303 8042 failed to reset
0311 8042 failed to accept the "WRITE CMD BYTE" command
0312 8042 failed to accept the data of the above command
0321 8042 failed to accept scancode from port 68
0322 8042 failed to respond to the above scancode
0323 8042 responded incorrectly to the above scancode
0331 8042 failed to accept command from port 6A
0332 8042 failed to generate SVC on port 67
0333 8042 generated HPINT type on port 65
0334 8042 failed the R/W register on port 69
0335 8042 failed to generate HPINT on IRQ 15
0336 8042 failed to generate HPINT on IRQ 12
0337 8042 failed to generate HPINT on IRQ 11
0338 8042 failed to generate HPINT on IRQ 10
0339 8042 failed to generate HPINT on IRQ 7
033A 8042 failed to generate HPINT on IRQ 5
033B 8042 failed to generate HPINT on IRQ 4
033C 8042 failed to generate HPINT on IRQ 3
0341 8042 failed keyboard interface test command
0342 8042didn't respond to interface command
0343 Keyboard clock line stuck low
0344 Keyboard clock line stuck high
0345 Keyboard data line stuck low
0346 Keyboard data line stuck high
0350 No ACK from keyboard self test command
0351 Bad ACK from keyboard self test command
0352 Keyboard is dead or not connected
0353 No result from keyboard self test command
0354 Keyboard self test failed
0401 8042 failed to enable gate A-20
0503 Serial port dead or non existent
0505 Serial port fails port register tests
0543 Parallel port dead or non-existent
06XX Stuck key; XX=scancode of key
0700 Failed to switch to slow mode
0701 Failed to switch to dynamic mode
0702 Timer (channel 0) failed to interrupt
0703 Memory cycles too slow in slow mode
0704 Memory cycles too fast in slow mode
0705 I/O cycles too slow in slow mode
0706 I/O cycles too fast in slow mode
0707 Memory cycles too slow in dynamic mode
0708 Memory cycles too fast in dynamic mode
0709 I/O cycles too slow in dynamic mode
070A I/O cycles too fast in dynamic mode
110X One of the timer channels failed to register test / X(0-2)=channel that failed
1200 Memory refresh signal stuck high
1201 Memory refresh signal stuck low
211X DMA 1 failed R/W test at register x (0-7)
212X DMA 2 failed R/W test at register x (0-7)
221X Bad DMA page register; X=register 0-7
300X HP-HIL controller failed self test; X=data
  X = xx1 = >read/write fail with data = 0DA5h
  X = xx1x = >read/write fail with data = 0DA5h
  X = x1xx = >read/write fail with data = 0DA5h
  X = 1xxx = >read/write fail with data = 0DA5h
3010 HP-HIL device test failed
4XYZ Lower 640K failed R/W test;
  X=0,2,4,6   Y>0=Bad U23     Z>0=Bad U13
  X=1,3,5,7   Y>0=Bad U43     Z>0=Bad U33
  X=8          Y>0=Bad U22     Z>0=Bad U12
  X=9          Y>0=Bad U42     Z>0=Bad U32
5XYZ Lower 640K failed marching ones test
  X = bbbx = > bbb (0-7) is # of 128K bank
  bbb0 = > Indicate even byte bad
  bbb1 = > Indicate odd byte bad
  YZ = bbbb bbbb = > Bits for which b = 1 are bad
61XY RAM address line XY stuck
  Some address lines to RAM are stuck to 0 or 1
  XY = 00bb bbbb = > RAM address line bbbbbb is stuck
  XY = 01bb bbbb = > Multiple address lines are stuck (bbbbbb is the first bad one)
620X Lower 640K parity error; Bank X
  X = Address in 64K bank where parity error occurred
  if X = 0 to y, U21 and/or U31 is/are bad
  if X = 8 to 9, U11 and/ore U41 is/are bad
63XY Parity error above 1MB; Bank XY
  Parity error has occurred during RAM test above the first MB
  XY = Address in 64K bank where parity occurred
6400 Parity generator failed to detect error
71XY Master 8259 failed R/W; bits XY
  XY = bbbb bbbb + > bits in which b = 1 is bad
72XY Slave 8259 failed R/W; bits XY
  XY = bbbb bbbb = > bits in which b = 1 is bad
7400 Master 8259 failed interrupt
7500 Slave 8259 failed interrupt
9XYZ Floppy drive controller error
  X=drive #
  Y=0=1st level error
      Z=0   Unsuccessful input from FD
      Z=1   Unsuccessful output to FDC
      Z=2  Error while executing seek
      Z=3  Error during recalibrate
      Z=4  Error verifying RAM buffer
      Z=5  Error while resetting FDC
      Z=6  Wrong drive identified
      Z=7  Wrong media identified
      Z=8  No interrupt from FDC
      Z=9  Failed to detect track 0
      Z=A  Failed to detect index pulse
  Y>1=Higher level error
  Y=1=Read sector error, side 0
  Y=2=Read sector error, side 1
  Y=3=Write sector error, side 0
  Y=4=Write sector error, side 1
  Y=5=Format sector error, side 0
  Y=6=Format sector error, side 1
  Y=7=Read ID error, side 0
  Y=8=Read ID error, side 1
      Z=1=No ID address mark
      Z=2=No data address mark
      Z=3=Media is write protected
      Z=4=Sector # wrong
      Z=5=Cylinder # wrong
      Z=6=Bad cylinder
      Z=7=DMA overrun
      Z=8=ID CRC error
      Z=9=Data CRC error
      Z=A=End of cylinder
      Z=B=Unrecognizable error
A001 No 80287 detected
A002 80287 failed stack register R/W test
A00C No zero-divide interrupt from 80287
CXYZ R/W error on extended RAM in XY bank
  Read/Write test failure on extended RAM
  X = 0 = > Even byte is bad
  X = 1 = > Odd byte is bad
  XY = Address in 64K bank where RAM failed
CFFF Extended RAM marching ones failed
  Marching on test failure on extended RAM
  X = 0 = > Even byte bad
  X = 1 = > Odd byte bad
  XA = Address in 64K bank where RAM failed

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HP Vectra QS & RS BIOS Post Codes

000F 386 CPU bad
0010 Bad checksum on ROM 0
0011 Bad checksum on ROM 1
011X RTC register is bad
0120 RTC failed to tick
0240 CMOS/RTC lost power
0241 Invalid checksum, IBM CMOS area
0280 Invalid checksum, HP CMOS area
02XY Bad CMOS register, at XY-40
0301 8042 failed to accept reset command
0302 8042 failed to respond to reset
0303 8042 failed on reset
0311 8042 didn't accept "WRITE CMD BYTE"
0312 8042 didn't accept data
0321 8042 failed to accept scancode, port 68
0322 8042 failed to respond to the above scancode
0323 8042 responded incorrectly to the above scancode
0331 8042 failed to accept command from port 6A
0332 8042 failed to generate SVC on port 67
0333 8042 generated HPINT type on port 65
0334 8042 failed the R/W register on port 69
0335 8042 failed to generate HPINT on IRQ 15
0336 8042 failed to generate HPINT on IRQ 12
0337 8042 failed to generate HPINT on IRQ 11
0338 8042 failed to generate HPINT on IRQ 10
0339 8042 failed to generate HPINT on IRQ 7
033A 8042 failed to generate HPINT on IRQ 5
033B 8042 failed to generate HPINT on IRQ 4
033C 8042 failed to generate HPINT on IRQ 3
0341 8042 failed keyboard interface test command
0342 8042didn't respond to interface command
0343 Keyboard clock line stuck low
0344 Keyboard clock line stuck high
0345 Keyboard data line stuck low
0346 Keyboard data line stuck high
0350 No ACK from keyboard self test command
0351 Bad ACK from keyboard self test command
0352 Keyboard is dead or not connected
0353 No result from keyboard self test command
0354 Keyboard self test failed
0401 8042 failed to enable gate A-20
0503 Serial port dead or non-existent
0505 Serial port fails port register tests
06XX Stuck key; XX=scancode of key
0700 Failed to switch to slow speed
0701 Failed to switch to fast speed
0702 Timer failed to interrupt
0703 CPU clock too slow in slow speed
0704 CPU clock too fast in slow speed
0707 CPU clock too slow in fast speed
0708 CPU clock too fast in fast speed
0709 Failed to switch bus clock to ATCLK
110X Timer X (0-2) failed to register test
1200 Memory refresh signal stuck high
1201 Memory refresh signal stuck low
211X DMA 1 failed R/W test at register x (0-7)
212X DMA 2 failed R/W test at register x (0-7)
221X Bad DMA page register; X=register 0-7
300X HP-HIL controller failed self test; X=data
  X = xxx1 = > read/write fail with data = 0DA5Ah
  X = xx1x = > read/write fail with data = 0DA5Ah
  X = x1xx = > read/write fail with data = 0DA5Ah
  X = 1xxx = > read/write fail with data = 0DA5Ah
3010 HP-HIL device test failed
4XYZ Lower 640K failed R/W test;
  X=0,2,4,6   Y>0=Bad U23     Z>0=Bad U13
  X=1,3,5,7   Y>0=Bad U43     Z>0=Bad U33
  X=8          Y>0=Bad U22     Z>0=Bad U12
  X=9          Y>0=Bad U42     Z>0=Bad U32
5XYZ Lower 640K failed marching ones test
  RAM in lower 640K failed read/write test
  X = bbcc = > bb is # 64K of 32 bit word bank
  cc = 00 = > byte 0 is bad
  cc = 01 = > byte 1 is bad
  cc = 02 = > byte 2 is bad
  cc = 03 = > byte 3 is bad
  YZ = bbbb bbbb = > bits for which b = 1 are bad
61XY RAM address line XY stuck
  Some address lines to RAM are stuck to 0 or 1
  XY = 00bb bbbb = > RAM address line bbbbbb is stuck
  XY = 01bb bbbb = > Multiple address lines are stuck bbbbbb is the first bad one
620X Lower 640K parity error; Bank X
  X = Address in 64K bank where parity occurred
63XY Parity error above 1MB; Bank XY
  XY = Address in 64K bank where parity occurred
6500 Shadow RAM bad at BIOS segment
6510 Shadow RAM bad at HP EGA segment
71XY Master 8259 failed R/W; bits XY
  XY = bbbb bbbb = > bits which b = 1 is bad
72XY Slave 8259 failed R/W; bits XY
  XY = bbbb bbbb = > bits which b = 1 is bad
7400 Master 8259 failed interrupt
7500 Slave 8259 failed interrupt
9XYZ Floppy drive controller error
  X=drive #
  Y=0=1st level error
      Z=0   Unsuccessful input from FD
      Z=1   Unsuccessful output to FDC
      Z=2  Error while executing seek
      Z=3  Error during recalibrate
      Z=4  Error verifying RAM buffer
      Z=5  Error while resetting FDC
      Z=6  Wrong drive identified
      Z=7  Wrong media identified
      Z=8  No interrupt from FDC
      Z=9  Failed to detect track 0
      Z=A  Failed to detect index pulse
  Y>1=Higher level error
  Y=1=Read sector error, side 0
  Y=2=Read sector error, side 1
  Y=3=Write sector error, side 0
  Y=4=Write sector error, side 1
  Y=5=Format sector error, side 0
  Y=6=Format sector error, side 1
  Y=7=Read ID error, side 0
  Y=8=Read ID error, side 1
      Z=1=No ID address mark
      Z=2=No data address mark
      Z=3=Media is write protected
      Z=4=Sector # wrong
      Z=5=Cylinder # wrong
      Z=6=Bad cylinder
      Z=7=DMA overrun
      Z=8=ID CRC error
      Z=9=Data CRC error
      Z=A=End of cylinder
      Z=B=Unrecognizable error
A001 No 80287 detected
A002 80287 failed stack register R/W test
A00C No zero-divide interrupt from 80287
AF00 Weitek coprocessor didn't enter protected mode
AF01 Weitek coprocessor nor present
AF02 Weitek coprocessor fails register test
AF05 Weitek coprocessor fails addition test
AF06 Weitek coprocessor fails interrupt test
AF0C Weitek coprocessor fails interrupt test
CXYZ R/W error on extended RAM in XY bank
  X = 0 = > Even byte bad
  X = 1 = > Odd byte bad
  XY = Address in 64K bank where RAM failed
CFFF No extended RAM found
EXYZ Extended RAM marching ones failure at XYZ
  X = 0 = > Byte 0 is bad
  X = 1 = > Byte 1 is bad
  X = 2 = > Byte 2 is bad
  X = 3 = > Byte 3 is bad

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HP Pavilion Series 3100 & 8000 BIOS Post Codes

02 Verify real mode
03 Disable NMI
04 Get processor type
06 Initialize system hardware
08 Initialize chipset with POST values
09 Set IN-POST flags
0A Initialize CPU registers
0B Enable CPU registers
0C Initialize cache to POST values
0E Initialize I/O component
0F Initialize local IDE bus
10 Initialize power management
11 Load alternate registers
12 Restore CPU control word during warm boot
13 Initialize PCI bus mastering devices
14 Initialize keyboard controller
16 BIOS ROM checksum
17 Initialize cache before memory size
18 Initialize 8254 timer
1A Initialize DMA controller
1C Reset PIC
20 Test DRAM refresh
22 Test 8742 keyboard controller
24 Set ES segment register to 4GB
26 Enable A-20 line
28 Autosize DRAM
29 Initialize POST memory manager
2A Clear 512K base RAM
2C RAM address line failure
2E RAM data failure, low byte
2F Enable cache before BIOS shadow
30 RAM data failure, high byte
32 Test CPU, BUS clock frequency
33 Initialize POST dispatch manager
34 Test CMOS RAM
35 Initialize alternate chipset registers
36 Warm start shut-down
37 Reinitialize chipset (MB only)
38 Shadow system BIOS ROM
39 Reinitialize cache (MB only)
3A Autosize cache
3C Configure advanced chipset registers
3D Load alternate registers new CMOS values
40 Set initial CPU speed
42 Initialize interrupts
44 Initialize BIOS interrupts
45 POST device initialization
46 Check ROM copyright notice
47 Initialize manager for PCI option ROM's
48 Check video config against CMOS
49 Initialize manager for PCI option ROM's
4A Initialize all video adapters
4B Display quiet boot screen
4C Shadow video BIOS
4E Display BIOS copyright notice
50 Display CPU type & speed
51 Initialize
52 Test keyboard
54 Set key click if enabled
56 Enable keyboard
58 Test for unexpected interrupts
59 Initialize POST display service
5A Display "Press F2 to Enter Setup"
5B Disable CPU cache
5C Test RAM, 512-640K
60 Test extended memory
62 Test extended memory address lines
64 Jump to user patch 1
66 Configure advanced cache registers
67 Initialize multi-processor APIC
68 Enable external & processor caches
69 Set up SMM area
6A Display external L2 cache size
6C Display shadow area message
6E Display high address for UMB recovery
70 Display error message
72 Check for configuration errors
74 Test real time clock
76 Check for keyboard errors
7A Test for key lock on
7C Set up hardware interrupt vectors
7E Initialize coprocessor, if present
80 Disable onboard super I/O ports
81 Late POST device initialization
82 Detect & install external RS-232 ports
83 Configure non-MDC IDE controllers
84 Detect & install external parallel ports
85 Initialize PnP ISA devices
86 Reinitialize onboard I/O ports
87 Configure motherboard configurable devices
88 Initialize BIOS data area
89 Enable NMI's
8A Initialize extended BIOS data area
8B Test & initialize PS/2 mouse
8C Initialize floppy controller
8F Determine number of ATA drives
90 Initialize hard disk controllers
91 Initialize local BUS HD controllers
92 Jump to user patch 2
93 Build MPTABLE for multiprocessor boards
94 Disable A-20 line
95 Install CD-ROM for boot
96 Clear huge ES segment register
97 Fix up multiprocessor table
98 Search for options ROM's
99 Check for smart drive
9A Shadow ROM option
9C Set up power management
9E Enable hardware interrupts
9F Determine number of ATA & SCSI drives
A0 Set time of day
A2 Check key lock
A4 Initialize typematic rate
A8 Erase F2 prompt
AA Scan for F2 keystroke
AC Enter SETUP
AE Clear IN-POST flag
B0 Check for errors
B2 POST done, prepare for boot
B4 One short beep before boot
B5 Terminate quiet boot
B6 Check password (optional)
B8 Clear global descriptor table
B9 Clean up all graphics
BA Initialize DMI parameters
BB Initialize PnP option ROM's
BC Clear parity checkers
BD Display multi boot menu
BE Clear screen optional
BF Check virus and backup reminders
C0 Try to boot with Int 19
C1 Initialize POST error manager
C2 Initialize error logging
C3 Initialize error display function
C4 Initialize system error handler
E0 Initialize the chipset
E1 Initialize the bridge
E2 Initialize the processor
E3 Initialize system timer
E4 Initialize system I/O
E5 Check force recovery boot
E6 Checksum BIOS ROM
E7 Got to BIOS
E8 Set huge segment
E9 Initialize multiprocessor
EA Initialize OEM special code
EB Initialize PIC & DMA
EC Initialize memory type
ED Initialize memory type
EE Shadow boot block
EF System memory test
F0 Initialize interrupt vectors
F1 Initialize runtime clock
F2 Initialize video
F3 Initialize beeper
F4 Initialize BOOT
F5 Clear huge segment
F6 Boot to mini-DOS
F7 Boot to full DOS

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Original IBM Beep Codes
 
 

IBM BIOS Beep Codes

Beeps

Error Message

Description

1 short Normal POST System is booting properly
2 short Initialization error Error code is displayed
1 long, 1 short System board error  
1 long, 2 short Video adapter error  
1 long, 3 short EGA/VGA adapter error  
3 long 3270 keyboard adapter error  
Continuous Power supply error Replace the power supply
999s Power supply error Replace the power supply
No beep Power supply Replace the power supply


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IBM BIOS POST Codes

 

IBM POST I/O Ports

Architecture Typical Computer Port
PC PC None
ISA XT 60
  AT 80
  PS/2 25,30 90,190
MCA PS/2 50 up 680, 3BC
EISA None None

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IBM POST Procedures

CPU Perform register test on the CPU by writing data patterns to the registers and reading the results of the write
ROM BIOS Checksum The value of the bits inside the BIOS chip(s) is added to a preset value that should create a total value of 00
CMOS RAM RAM within the CMOS chip is tested by writing data patters tot he area and verifying that the data was stored correctly
DMA Test DMA chips by forcing control inputs to the CPU to an active state and verifying that the proper reactions occur
8042/8742 Keyboard Controller Test including Gate A20 and the reset command.  The buffer space is prepared and data is sent to the determined area via the keyboard controller to see if commands are received and executed correctly
Base 64K System RAM Perform a walking bit test on the first 64K of RAM so the BIOS vector area can be initialized.  Check for bad RAM chips or a data/address line
8259A PIC Determine if commands to interrupt CPU processes are carried out correctly.  Check the PIC, PIT, RTC, CMOS and Clock chips
8254 PIT Check that proper setup and hold times are given to the PIC for interrupts of the CPU processes.  Check the PIT or Clock chip
82385 Cache Controller This is normally responsible for cache and shadow memory
CMOS RAM Configuration Data Check information in CMOS RAM before further testing so any failures after this could also be down to the CMOS chip
CRT Controllers Test any video adapters listed in the CMOS
RAM above 64K perform walking bit pattern test on memory above 64K listed in CMOS
Keyboard Test interface to the keyboard including scan code stuck keys etc.
Pointing Device Test and initialize vector for any pointing devices found.  Failure to see a device may be down to the device itself but there may be a problem with the CMOS or 8042/8742
Diskette Drive A: Test and initialize the A: drive
Serial Interface Circuitry Test any RS232 devices found at the proper I/O address
Diskette Controllers In an A: drive has been found further testing is performed before proceeding to the bootloader.  This test includes reading the first sector of any diskette in the drive to see if a valid boot code is there
Fixed Disk Controllers Test and initialize any hard drives set in the CMOS including reading the first sector of the hard drive to see if a valid boot code exists

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IBM XT BIOS (Port 60)

00 or FF CPU register test failed
01 BIOS ROM checksum failed
02 System timer 1 failed
03 8237 DMA register Read/Write failed
04 Base 32K RAM failed

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IBM AT BIOS

01 CPU flag and register tested
02 BIOS ROM checksum tested
03 CMOS shutdown byte 0F tested
04 8254 PIT channel 0 tested
05 8254 PIT channel 1 tested
06 8237 DMA initialize registers test 0
07 8237 DMA initialize registers test 1
08 DMA page register tested
09 Memory refresh tested
0A Soft reset tested
0B 8042 keyboard controller reset
0C 8042 keyboard controller reset OK
0D 8042 keyboard controller reset
0E Memory tested
0F I/P buffer switch settings obtained
DD RAM error
11 Protected mode initialized
12 Protected mode registers tested
13 8259 PIC #2 initialized
14 Temporary Interrupt vectors setup
15 BIOS Interrupt vectors obtained
16 CMOS checksum and battery OK
17 Defective CMOS battery flag set
18 CMOS set checked
19 CMOS return address byte set
1A Temporary stack set
1B Segment address 01-0000, second 64K, tested
1C Memory size; See if 512K or 640K present
1D Segment address 10-000, over 640K, tested
1E Expansion memory set as is reported by the CMOS
1F Address lines 19-23 tested
20 Preparing to return to protected mode
21 Return from protected mode successful; 6845 video controller initialized and started
22 6845 video controller tested
23 EGA/VGA BIOS tested
24 8259PIC Read/Write mask register with 1's and 0's
25 Interrupt mask registers tested
26 Unexpected Interrupts checked for; Error 101 displayed
27 System board tested: POST logic
28 Unexpected NMI Interrupts tested for
29 8253 PIT timer tested
2A 8253 timer tested
2B 8253 timer initialized; System board error
2C 8253 timer Interrupt initialization; System board failure
2D 8042 keyboard controller checked for command
2F 8042 keyboard checked for warm boot
30 Shutdown return 2 set
31 Protected mode enabled
32 Address lines 0-15
33 Next block of 64K RAM tested
34 Real mode enabled
35 8042 keyboard controller tested
36 Check for keyboard error
38 8042 keyboard controller failed
3A 8042 keyboard controller initialized
3B Expansion ROM's checked for in 2K blocks
3C Floppy drive controller tested
3D Initialize the floppy drive controller
3E Initialize hard disk controller
3F Initialize parallel port
40 Hardware Interrupt enabled
41 System code at segment E0000h checked for
42 Exit to system code
43 Call to boot loader
44 Boot from fixed disk
45 Unable to boot from fixed disk; Boot to BASIC
81 Descriptor table built
82 Virtual mode started
90-B6 Memory and bootstrap testing done
F0 Data segment set
F2 Interrupts tested
F1 Exception Interrupts tested
F3 Verify 286 protected mode instructions (LDT/SDT and LTR/STR)
F4 Verify 286 protected mode instructions (Bound instruction)
F5 Verify 286 protected mode instructions (Push and pop)
F6 Verify 286 protected mode instructions (Access rights)
F7 Verify 286 protected mode instructions (RPL field adjusted)
F8 Verify 286 protected mode instructions (LAR function)
F9 Verify 286 protected mode instructions (LSL instruction)
FA Verify 286 protected mode instructions (Memory chip selected)

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IBM PS/2 (Micro Channel) BIOS

00 CPU tested with patter FFAA0055
01 CPU 32 register tested
02 BIOS ROM checksum tested
03 System port 94 enabled and checked
04 POST registers, port 102 enabled and checked
05 POST registers port 96 enabled and tested
06 CMOS shutdown byte 0F tested
07 CMOS extended port 74-76 enabled and tested
08 DMA and page registers tested (ports 2, 18, 1A and 1C)
09 DMA initialized
0A Memory refresh tested
0B 8042 keyboard controller buffers tested (ports 61 and 64)
0C 8042 keyboard controller internal test (port 60)
0D 8042 keyboard controller internal test continued
0E 8042keyboard controller self test error
0F Memory sized and setup
10 First 512K base memory tested
11 Base memory error, system halted
12 Protected mode instructions tested; Keyboard commands tested
13 PIC Interrupt controller 1 (master) tested
14 PIC Interrupt controller 2 (slave) tested
15 Initialize 120 Interrupt vectors
16 Initialize 16 extended vectors
17 CMOS/RTC tested; CMOS byte 0D tested
18 CMOS/RTC checksum tested
19 CMOS/RTC battery tested
1A Check for soft or hard reset
1B Protected mode initialization
1C Protected mode stack set; Pointer to end of first 64K set
1D Low memory size tested in protected mode
1E Memory size information saved
1F Memory split address setup
20 Check for extended memory beyond 64MB
21 Test memory-address bus lines
22 Clear parity error and channel lock
23 Initialize interrupt 0
24 Check CMOS RAM validity
25 Write keyboard-controller command byte
40 Check valid CMOS RAM and video system
41 Display error code 160
42 Test registers in both interrupt controllers
43 Test interrupt controller registers
44 Test interrupt mask registers
45 Test NMI
46 NMI error has been detected
47 Test system timer 0
48 Check system speaker clock
49 Test system timer 0 count
4A Test system timer 1 count
4B Check if timer interrupt occurred
4C Test timer 0 for improper operation (too fast or too slow)
4D Verify timer interrupt 0
4E Check 8042 keyboard controller
4F Check for soft reset
50 Prepare for shutdown
51 Start protected mode test
52 Test memory in 64KB increments
53 Check if memory test done
54 Return to real mode
55 Test for regular or manufacturing mode
56 Disable the keyboard
57 Check for keyboard self test
58 Keyboard test passed
59 Test the keyboard controller
5A Configure the mouse
5B Disable the mouse
5C Initialize interrupt vectors
5D Initialize interrupt vectors
5E Initialize interrupt vectors
60 Save DDNIL status
61 Reset floppy drive
62 Test floppy drive
63 Turn floppy-drive motor off
64 Set up serial ports
65 Enable real time clock interrupt
66 Configure floppy drives
67 Configure hard drives
68 Enable system CPU arbitration
69 Scan for adapter ROM's
6A Verify serial and parallel ports
6B Set up equipment byte
6C Set up configuration
6D Set keyboard-typematic rate
6E Call Int. 19 boot loader


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Landmark BIOS POST Codes

 
Landmark Jumpstart XT BIOS Post Codes | Landmark Jumpstart AT BIOS Post Code | Landmark Supersoft AT BIOS Post Codes

 

Landmark Jumpstart XT BIOS Post Codes

01 Jump to reset area in BIOS ROM
02 Initialize DMA page register
03 Initialize DMA refresh register
04 Clear all RAM
05 Perform RAM test on first 64KB
06 Clear first 64KB
07 Initialize BIOS stack to 0FC0h
08 Set the equipment flag based on XT switches
09 Initialize default-interrupt vectors
0A Initialize the 8255 parallel interface, if it exists
0B Initialize the 8259 PIT and enable interrupts
0C Setup adapters and peripherals
0D Setup video system
0E Initialize the video system
0F Initialize the equipment
10 Initialize memory configuration
11 Setup system timer function
12 Initialize system timer
13 Setup time-of-day function
14 Initialize time of day from RTC data
15 Setup and initialize "print screen" function
16 Setup and initialize cassette interface, if available
17 Setup and initialize bootstrap function
18 Setup and initialize keyboard function
19 Enable speaker
1A Setup system timer
1B Enable the RTC
1C Setup timer 2
1D Determine memory size; write 55Aa/AA55 to first and last word in segment
1E Read first and last word of segment
1F Compare first and last words
20 Report found memory size of segment
21 Perform BIOS ROM checksum test
22 Perform complete RAM testing on cold boot
23 Move system stack to bottom of memory and save pointer 40:0E
24 Reset parity after RAM sizing
25 Enable timer and keyboard interrupts
26 Setup the serial and parallel ports
27 Setup the game port
28 Setup the floppy-disk controller
29 Scan for optional ROM's in 2KB chucks from C8000h
2A Call the boot loader

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Landmark Jumpstart XT BIOS Post Codes

03 Sound one short beep
04 Initialize the bell tone
05 Enable CMOS RAM
06 Reset video controller
07 Disable parity checking
08 Start memory refresh
09 Clear the reset flag in RAM
0A Test DMA page registers
10 Use CMOS to determine if a soft reset has occurred
11 Check BIOS ROM checksum
12 Test system timer A
13 Test DMA channel 0
14 Test DMA channel 1
15 Test memory refresh
16 Flush 8042 keyboard controller input buffer
17 Reset 8042 keyboard controller
18 Get keyboard type
19 Initialize the keyboard
1A Clear any existing parity
1B Enable on-board parity
1C Test base 64KB memory
1D Test base 64K parity
1E Initialize POST stack
20 Check keyboard type
21 Test protected mode CPU registers
22 Initialize 8259 programmable interrupt controller
23 Initialize all interrupts
24 Test all interrupts
25 Perform DRAM checksum
26 Adjust configuration based on hardware found and CMOS settings
27 Check for presence of manufacturing switch
28 Initialize video controller
2A Test video memory
2B Test video sync
2C Check for auxiliary video controller
2D Change video configuration
2F Initialize the video system
30 Change video interrupt
31 Display any POST messages
32 Test memory and calculate size
33 Adjust memory configuration
34 Enable I/O parity
35 Test 8259 programmable interrupt controller
36 perform byte-swap test
37 Test NMI
38 Perform timer test
39 Initialize system timer A
3A Protected mode memory test
3B Test keyboard
3C Test keyboard interrupt
3D Enable A20
3E Reset hard disk controller
3F Setup floppy disk controller
40 Test floppy drive system
41 Setup keyboard
42 Enable interrupt timer
43 Check for dual floppy disk/hard disk controller
44 Locate floppy drive A
45 Locate floppy drive B
46 reset hard disk controller
47 Enable slave DMA
48 Locate any external ROM's
49 Initialize the parallel ports
4A Initialize the serial ports
4B Initialize the math coprocessor
4C Read CMOS RAM status
4D Check CMOS configuration against detected hardware
4E Initialize timer ticks
4F Enable IRQ9
50 Enable on-board parity
51 Run any add-on ROM's
52 Enable keyboard interrupt
53 Reset the parallel port
60 Check for any errors
61 Sound one short beep
62 Print sign-on message
64 Call interrupt 19 boot loader

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Landmark Supersoft AT BIOS Post Codes

11 CPU register or logic error
12 ROMPOST A checksum error
13 ROMPOST B checksum error
14 8253 programmable interrupt timer channel 0
15 8253 programmable interrupt timer channel 1
16 8253 programmable interrupt timer channel 2
17 8237 DMA controller 1 error
18 8237 DMA controller 2 error
19 DMA page register error
1A 8042 keyboard controller error
21 Scan 16KB critical RAM error
22 Memory refresh error
23 CPU protected mode error
24 8259 interrupt controller 1 error
25 8259 interrupt controller 2 error
26 Unexpected interrupt detect
27 Interrupt 0, system timer, error
28 CMOS RTC error
29 NMI error
2A Locate and test math coprocessor
31 Keyboard controller error
32 Stuck key detected or CMOS RAM error
33 Floppy controller error
34 Floppy disk read error
35 MDA video memory error
36 Color video memory error
37 EGA/VGA RAM error
38 BIOS ROM checksum error
41 Memory error
42 Refresh fault
43 Display problem
44 Display problem
45 Display problem
59 No monitor detected

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Microid Research/Mr BIOS POST Codes

 
Microid Research/Mr. BIOS Post Procedures | OEM Specific Post Procedures | Microid Research/Mr. BIOS Non-Fatal Errors | Microid Research BIOS Post Codes 1.0A | Microid Research Contemporary BIOS Post Codes | Mr. BIOS Post Codes Version 3.4x

 

Microid Research/Mr. BIOS Post Procedures

Reset See if warm boot (Ctrl+Alt+Del) or a cold boot (Reset) is needed
Chipset Initialization Reset the support chips (8259) DMA's and timers to defaults before proceeding
Disable Chips Disable NMI, DMA and Video (6845) to get accurate results later.  Failure here is normally a NMI generated by one of these disabled chips
ROM BIOS Checksum Perform checksum test on the ROM BIOS.   Add a preset value stored in BIOS to create a value of 00
DMA Test Perform a test of the page registers in the DMA controller
Keyboard Controller Test Send a command to the 8042 keyboard controller to perform a selftest.  The keyboard controller will return a buffer and error buffer address
Chipset Initialization Initialize the DMA (8237), PIC (8259), PIT (8254) and RTC chips
DMA Test Test the registers of the master 16-bit and slave 8-bit DMA controllers by writing bit patterns and reading the results
Cache and Shadow Disable Disable cache and shadow RAM before proceeding with POST
Refresh Test interval in which PIT (8254) chip sends a refresh signal to the DMA chips
Base 64K Memory Test Test the first 64K of system memory with a walking bit pattern
PIC Test Test the mask registers of the master and slave interrupt controllers by setting the mask-bit in the registers and generating an interrupt to see if the interrupt is trapped.  Then test the additional registers in the PIC's with a walking bit pattern
PIT Test Test the interrupt timer channels 0-2 and initialize if no failures occur
RTC Perform a read/write test of RTC portion of the CMOS and initialize the RTC if no failures occur
Video Test and initialize the video adapter, which will perform an internal diagnostic and sign on before returning an OK status
CMOS Checksum Perform a checksum on the system RAM
Keyboard Initialization Initialize the keyboard and read the buffer address for errors

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OEM Specific Post Procedures

Base Memory Test Test memory addresses between 64K and 640K with a walking bit pattern.  There may be a hex display of the failing bit
Keyboard 2nd Interrupt Tries again if the first attempt failed
Protected Mode Test Test the ability of the keyboard controller address line 20 to respond to commands that switch the CPU in and out of protected mode
Extended Memory Test Test addresses above 1MB in 64K blocks and perform pattern tests
OEM Memory Normally test the cache controller and shadow RAM
RTC Time Test Test the write active line of the CPU through I/O ports reserved for RS232 devices.  Failure to see a device could be the device itself or more than one set of the same port.  Checks are only made for two devices
Parallel; Check for parallel devices.   Failure to see a device could be the device itself or more than one using the same port.  Checks are only made for three
NPU Test Perform a register test on the NPU then initialize if passed
Floppy Test Test floppy controller and drive
Fixed Disk Test fixed disk controller and drive and compare the results against the CMOS setting.  This is skipped if no drive is installed
CMOS Update Update information in CMOS RAM based on the previous results

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Microid Research/Mr. BIOS Non-Fatal Errors

Lock Check Check if a system lock-byte is set and wait for user response if an error is generated.  Check the panel lock or circuitry
Numlock/Password/Setup Set Numlock on (if set) and ask for password (if set) and display setup message
Typematic Rate Set the typematic rate
Floppy Disk Perform any further initialization needed
Hard Disk Perform any further initialization needed
Video Mode Set primary video mode and display any errors found during initialization routines
Shadow and Cache Enable The shadow RAM and cache are enabled
Adapter ROM Initialize adapters with a ROM signature of 55AA.  Self tests will be performed by the equipment concerned before handing back control to the POST
Video Monitor Mode Set the video mode based on the information in the CMOS and update the time variables from the RTC
Parity/NMI Enable Enable NMI by setting bit 7 of CMOS address 41 and enable parity.  There should be no failures during this
Set Stack Set the last significant byte of the stack pointer and install the shadow RAM at E000 if set by CMOS
Acknowledge Acknowledge errors and set primary video mode before calling Int 19 bootloader.  Errors reported will await a keyboard repines before proceeding.  Errors beyond this point are normally software related

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Microaid Research BIOS Post Codes 1.0A

01 Chipset problem
02 Disable NMI and DMA
03 Check BIOS ROM checksum
04 Test DMA page register
05 Keyboard controller test
06 Initialize the RTC, 8237, 8254, and 8259
07 Check memory refresh
08 DMA master test
09 OEM specific test
0A Test memory bank 0
0B Test PIC units
0C Test PIC conditions
0D Initialize PIT channel 0
0E Initialize PIT channel 2
0F Test CMOS RAM battery
10 Check video ROM
11 Test RTC
12 Test keyboard controller
13 OEM specific test
14 Run memory test
15 Keyboard controller
16 OEM specific test
17 Test keyboard controller
18 Run memory test
19 Execute OEM memory test
1A Update RTC contents
1B Initialize serial ports
1C Initialize parallel ports
1D Test math coprocessor
1E Test floppy disk
1F Test hard disk
20 Validate CMOS contents
21 Check keyboard lock
22 Set NUM lock on keyboard
23 OEM specific test
29 Test adapter ROM's
2F Call interrupt 19 boot loader

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Microid research Contemporary BIOS Post Codes

03 ROM BIOS checksum failure
04 DMA page register failure
05 Keyboard controller selftest failure
08 Memory refresh circuitry failure
09 Master 16-bit DMA controller failure
09 Slave 8-bit DMA controller failure
0A Base 64K pattern test failure
0A Base 64K parity circuitry failure
0A Base 64K parity error
0A Base 64K data bus failure
0A Base 64K address bus failure
0A Base 64K block access read failure
0A Base 64K block access write failure
0B Master 8259 failure
0B Slave 8259 failure
0C Master 8259 interrupt address failure
0C Slave 8259 interrupt address failure
0C 8259 interrupt address error
0C Master 8259 stuck interrupt error
0C Slave 8259 stuck interrupt error
0C System timer 8254 channel 0/IRQ 0 failure
0D 8254 channel 0, speaker detect, failure
0E 8254 channel 2 speaker failure
0E 8254 OUT2, speaker detect, failure
0F CMOS RAM read/write test failure
0F CMOS read/write test failure
0F RTC periodic interrupt / IRQ 8 failure
10 Video ROM checksum failure
11 RTC battery discharged or CMOS contents corrupt
12 Keyboard controller failure
12 Keyboard error, stuck key
14 Memory parity error
14 I/O channel error
14 RAM pattern test failed
15 Keyboard failure or no keyboard present
17 A20 test failure caused by 8042 timeout
17 A20 gate stuck in disabled state
17 A20 gate stuck in asserted state
18 Parity circuit failure
19 Data bus test failure, address line test failed, block access read failure, block access read/write failure, or banks decode to same location
1A Real time clock is not updating
1A Real time clock settings are invalid
1E Diskette CMOS configuration invalid, diskette controller failure, or diskette drive A: failure or diskette drive B: failure
1F FDD CMOS configuration invalid, fixed disk C: failure, or fixed disk D: failure
20 Fixed disk configuration change, diskette configuration change, serial port configuration change, parallel port configuration change, video configuration change, memory configuration change, or coprocessor configuration change
21 System key is in locked position
29 Adapter ROM checksum failure

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Mr. BIOS Post Codes Version 3.4x

00 Cold start
01 Initialize KBD controller, Disable CPU cache, Initialize onboard I/O chipset, Test RAM size
02 Disable critical I/O
03 Checksum the BIOS ROM
04 Test page register
05 Enable A20 gate, issue 8042 keyboard controller self test
06 Initialize ISA I/O
07 Warm initialize KBD controller & I/O chipset
08 Refresh toggle test
09 Test DMA master & slave registers
0A Test first 64KB of base memory
0B Test master 8259 mask, test slave 8259 mask
0C Test 8259 slave, initialize interrupt vectors 00-77h, initialize keyboard buffer variables
0D Test timer 0, 8254 channel 0
0E Test 8254 channel 2, speaker channel
10 Turn on monitor, show error messages
11 Read and checksum the CMOS
12 Call video ROM initialization routines
13 Set 8Mhz AT-bus
14 Size and test memory, stuck NMI check
15 No keyboard and power on, retry keyboard initialization
16 Size and test CPU cache
17 Test A20 off and on gates
18 External memory size, stuck NMI check
19 System memory size, stuck NMI check
1A Test RTC time
1B Determine serial ports
1C Determine parallel ports
1D Initialize numeric coprocessor
1E Determine floppy diskette drive controllers
1F Determine IDE controllers
20 Display CMOS configuration changes
21 Clear screens
22 Set/reset numlock LED, security functions
23 Final onboard serial and parallel ports check
24 Set keyboard typematic rate
25 Initialize floppy controller
26 Initialize ATA discs
27 Set video mode for primary adapter`
28 Cyrix WB-CPU support, purge 8259 slave
29 Reset A20 to OFF, Install adapter ROM's
2A Clear primary screen, convert RTC to system ticks, set final DOS timer variable
2B Enable NMI and latch
2E Fast A20, fix A20
2F Purge 8259 slave, control to interrupt 19 boot
32 Test CPU burst
34 Determine 8042, set warm boot flag STS 2
35 Test high memory area wrap, verify A20 via F000:10 high memory area
37 CPU step NZ, CPUID, disable CPU features
38 Set 8042 pins
39 PCI bus
3A Scan PCI bus
3B Initialize PCI bus with intermediate defaults
3C Initialize PCI OEM: OEM bridge
3D PCI bus and Plug & Play: initialize AT slotman from AT bus CDE usage
3E Find phantom CDE ROM PCI cards
3F PCI bus: final fast back-to-back state
40 OEM post initialization, hook audio
41 Allocate I/O on PCI bus, logs in PCI-IDE
42 Hook PCI-ATA chips
43 Allocate IRQ's to PCI bus, enable ATA IRQ's
44 Allocate and enable PCI memory/ROM space
45 Determine PS/2 mouse
46 Map IRQ's to PCI bus, enable ATA IRQ's
47 PCI-ROM install, note user CMOS
48 If setup conditions: execute setup utility
49 Test F000, transfer EPROM to shadow RAM
4A Hook VLATA chip
4B Identify and spin up all drives
4C Detect secondary IRQ, if VL/AT bus IDE exists but it's IRQ not known yet
4D Detect /log 32-bit I/O ATA devices
4E Atapi drive M/S bitmap to shadow RAM, set interrupt 13 vector
4F Finalize shadow RAM
50 Chain interrupt 13
51 Load Plug & Play, processor vector initialized, BIOS vector initialized, OEM vector initialized
52 Scan for Plug & Play, update Plug & Play device count
53 Supplement IRQ usage, AT IRQ's
54 Conditionally assign everything Plug & Play wants
58 OEM custom boot sequence just prior to interrupt 19 boot
59 Pass control to interrupt 19 boot
5A Display MR BIOS logo
88 Dead motherboard and/or BIOS ROM
FF BIOS POST finished

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Original IBM Beep Codes
 
 

Mylex BIOS Beep Codes

Beeps

Error Message

Description

1 Normal boot System is booting normally
2 Video adapter error The video adapter is either faulty or not seated properly.  Check the adapter
3 Keyboard controller error The keyboard controller IC is faulty.   Replace the IC if possible
4 Keyboard error The keyboard controller IC is faulty or the keyboard is faulty.  Replace the keyboard, if problem still persists, replace the keyboard controller IC
5 PIC 0 error The programmable interrupt controller is faulty.  Replace the IC if possible
6 PIC 1 error The programmable interrupt controller is faulty.  replace the IC if possible
7 DMA page register error The DMA controller IC is faulty.   Replace the IC if possible
8 RAM refresh error  
9 RAM data error  
10 RAM parity error  
11 DMA controller 0 error The DMA controller IC for channel 0 has failed
12 CMOS RAM error The CMOS RAM has failed
13 DMA controller 1 error The DMA controller IC for channel 1 has failed
14 CMOS RAM battery error The CMOS RAM battery has failed.   If possible, replace the CMOS or battery
15