AMI BIOS Tone POST Codes - Fatal Errors
| Tone |
Condition |
| 1 short |
DRAM refresh |
| 2 short |
Parity circuit |
| 3 short |
Base 64K RAM |
| 4 short |
System timer |
| 5 short |
Processor |
| 6 short |
Keyboard controller gate A20 |
| 7 short |
Virtual mode exception |
| 8 short |
Display memory read/write test |
| 9 short |
ROM BIOS checksum |
| 10 short |
CMOS shutdown read/write |
| 11 short |
Cache memory |
AMI BIOS Tone POST Codes - Non-Fatal Errors
| Tone |
Condition |
| 1 long, 3 short |
Conventional/extended memory |
| 1 long, 8 short |
Display/retrace test |
Phoenix BIOS Tone POST Codes - Fatal Errors
| Tone |
Condition |
| None |
CPU register test |
| None |
First 64K RAM test |
| None |
Interrupt vector loading proceeding |
| None |
CMOS power failure/checksum calculation |
| None |
Display configuration validation proceeding |
| None |
Display running with video ROM |
| None |
Display functional |
| None |
Mononchrome display functional |
| None |
CGA display functional |
| 1-1-3 |
CMOS write/read |
| 1-1-4 |
ROM BIOS checksum |
| 1-2-1 |
Programmable interval timer |
| 1-2-2 |
DMA Initialization |
| 1-2-3 |
DMA page register write/read |
| 1-3-1 |
RAM refresh verification |
| 1-3-3 |
st 64K RAM chip or data line |
| 1-3-4 |
First 64K RAM odd/even logic |
| 1-4-1 |
Address line first 64K RAM |
| 1-4-2 |
Parity failure first 64K RAM |
| 2-1-1 |
Bit 0, first 64K RAM |
| 2-1-2 |
Bit 1, first 64K RAM |
| 2-1-3 |
Bit 2, first 64K RAM |
| 2-1-4 |
Bit 3, first 64K RAM |
| 2-2-1 |
Bit 4, first 64K RAM |
| 2-2-2 |
Bit 5, first 64K RAM |
| 2-2-3 |
Bit 6, first 64K RAM |
| 2-2-4 |
Bit 7, first 64K RAM |
| 2-3-1 |
Bit 8, first 64K RAM |
| 2-3-2 |
Bit 9, first 64K RAM |
| 2-3-3 |
Bit 10, first 64K RAM |
| 2-3-4 |
Bit 11, first 64K RAM |
| 2-4-1 |
Bit 12, first 64K RAM |
| 2-4-2 |
Bit 13, first 64K RAM |
| 2-4-3 |
Bit 14, first 64K RAM |
| 2-4-4 |
Bit 15, first 64K RAM |
| 3-1-1 |
Slave DMA register |
| 3-1-2 |
Master DMA register |
| 3-1-3 |
Master interrupt mask register |
| 3-1-4 |
Slave interrupt mask register |
| 3-2-4 |
Keyboard controller |
| 3-3-4 |
Display initialization |
| 3-4-1 |
Display retrace |
| 3-4-2 |
Search for video ROM proceeding |
Phoenix BIOS POST Tone Codes - Non-Fatal Errors
| Tone |
Condition |
| 4-2-1 |
Timer tick interrupt test |
| 4-2-2 |
Shutdown test |
| 4-2-3 |
Gate A20 Failure |
| 4-2-4 |
Unexpected interrupt in protected mode |
| 4-3-1 |
RAM test |
| 4-3-3 |
Interval timer channel 2 |
| 4-3-4 |
Real time clock |
| 4-4-1 |
Serial Port |
| 4-4-2 |
Parallel Port |
| 4-4-3 |
Math Co-processor test |
| 1-1-2* |
System board select |
| 1-1-3* |
Extender CMOS RAM |
| *audio code pattern preceded by low pitched tone |
IBM POST Tone Codes
| Tone |
Condition |
| none |
System board, power supply |
| 1 short |
System passed all tests |
| 2 short |
Display error |
| continuous |
System board, power supply |
| 1 long, 1 short |
System board |
| 1 long, 2 short |
Video adapter |
| 1 long, 3 short |
EGA |
| 3 long |
3270 keyboard card |
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