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Articles / TULARC / PC info / |  |
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BIOS POST Tone Error Codes |
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| 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 |
| TONE | CONDITION |
|---|---|
| 1 long, 3 short | Conventional/extended memory |
| 1 long, 8 short | Display/retrace test |
| 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 | First 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 |
| 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 moe |
| 4-3-1 | RAM test (address failure >FFFFh) |
| 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
| 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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