| Code
|
Meaning
|
| 00
|
Flag
test |
| 03
|
Register
test |
| 06
|
System
hardware initialisation |
| 09
|
BIOS
ROM checksum |
| 0C
|
Page
register test |
| 0F
|
8254
timer test |
| 12
|
Memory
refresh initialisation |
| 15
|
8237
DMA controller test |
| 18
|
8237
DMA initialisation |
| 1B
|
8259
interrupt controller initialisation |
| 1E
|
8259
interrupt controller test |
| 21
|
Memory
refresh test |
| 24
|
Base
64K address test |
| 27
|
Base
64K memory test |
| 2A
|
8742
keyboard self test |
| 2D
|
MC
146818 CMOS test |
| 30
|
Start
first protected mode test |
| 33
|
Memory
sizing test |
| 36
|
First
protected mode test |
| 39
|
First
protected mode test failed |
| 3C
|
CPU
speed calculation |
| 3F
|
Read
8742 hardware switches |
| 42
|
Initialise
interrupt vector area |
| 45
|
Verify
CMOS configuration |
| 48
|
Test
and initialise video system |
| 4B
|
Unexpected
interrupt test |
| 4E
|
Start
second protected mode test |
| 51
|
Verify
LDT instruction |
| 54
|
Verify
TR instruction |
| 57
|
Verify
LSL instruction |
| 5A
|
Verify
LAR instruction |
| 5D
|
Verify
VERR instruction |
| 60
|
Address
line 20 test |
| 63
|
Unexpected
exception test |
| 66
|
Start
third protected mode test |
| 69
|
Address
line test |
| 6C
|
System
memory test |
| 6F
|
Shadow
memory test |
| 72
|
Extended
memory test |
| 75
|
Verify
memory configuration |
| 78
|
Display
configuration error messages |
| 7B
|
Copy
system BIOS to shadow memory |
| 7E
|
8254
clock test |
| 81
|
MC
146818 real time clock test |
| 84
|
Keyboard
test |
| 87
|
Determine
keyboard type |
| 8A
|
Stuck
key test |
| 8D
|
Initialise
hardware interrupt vector |
| 90
|
Math
coprocessor test |
| 93
|
Determine
COM ports available |
| 96
|
Determine
LPT ports available |
| 99
|
Initialise
BIOS data area |
| 9C
|
Fixed/Floppy
controller test |
| 9F
|
Floppy
disk test |
| A2
|
Fixed
disk test |
| A5
|
External
ROM scan |
| A8
|
System
key lock test |
| AE
|
F1
error message test |
| AF
|
System
boot initialisation |
| B1
|
Interrupt
19 boot loader |
