| 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 |
