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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