Supersoft BIOS POST Codes

 

SuperSoft PC/XT/AT BIOS Post Codes

 

XT BIOS

11 CPU register or logic error
12 ROM POST checksum error
13 8253 programmable interrupt timer channel 0 error
14 8253 programmable interrupt timer channel 1 error
15 8253 programmable interrupt timer channel 2 error
16 8237A DMA controller error
17 8255 parity error detected
18 16K RAM critical region error
19 Memory refresh error
1A -
21 8259 interrupt controller error
22 Unexpected interrupt detected
23 Interrupt 0 (timer) error
24 Nonmaskable interrupt error
25 MDA video memory error
26 CGA video memory error
27 EGA/VGA memory error
28 8087 math coprocessor error
29 Keyboard controller error
2A -
31 Keyboard scan lines/stuck key
32 Floppy controller error
33 Floppy disk read error
34 Memory error at address x
35 Slow refresh, address x
36/37 -
38 -
41 BIOS ROM checksum error
42 BASIC ROM 1 checksum error
43-45 Basic ROM 2,3,4 checksum error

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AT BIOS

11 CPU register or logic error
12 ROM POST A checksum error
13 ROM B POST checksum error
14 8254 programmable interrupt timer channel 0 error
15 8254 programmable interrupt timer channel 1 error
16 8254 programmable interrupt timer channel 2 error
17 8237A DMA controller 1 error
18 8237A DMA controller 2 error
19 DMA page registers error
1A 8042 parity error detected
21 16K RAM critical region error
22 Memory refresh error
23 CPU protected mode error
24 8259 programmable interrupt controller 1 error
25 8259 programmable interrupt controller 2 error
26 Unexpected interrupt detected
27 Interrupt 0 (timer) error
28 CMOS real time clock error
29 Nonmaskable interrupt error
2A 8087 math coprocessor error
31 Keyboard controller error
32 Stuck key or CMOS RAM error
33 Floppy controller error
34 Floppy disk read error
35 MDA video memory error
36/37 CGA, EGA/VGA RAM error
38 BIOS ROM checksum error
41 Memory error at address x
42 Slow refresh, address x
43-45 Display pass count
59 No monitor

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