| Code |
Meaning |
| 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 |
