| POST Code (Hex) |
| POST Routine Description |
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| 51h | Reserved |
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| 52h | Test all memory (clear all extended memory to 0) |
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| 53h | Clear password according to H/W jumper (Optional) |
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| 54h | Reserved |
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| 55h | Display number of processors |
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| 56h | Reserved |
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| 57h | 1 | Display PnP logo |
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| 2 Early ISA PnP initialization |
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| Assign CSN to every ISA PnP device |
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| 58h | Reserved |
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| 59h | Initialize the combined Trend |
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| 5Ah | Reserved |
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| 5Bh | (Optional Feature) Show message for entering AWDFLASH.EXE from FDD |
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| 5Ch | Reserved |
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| 5Dh | 1 | Initialize Init_Onboard_Super_IO |
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| 2 Initialize Init_Onbaord_AUDIO |
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| 5Eh | Reserved |
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| 5Fh | Reserved |
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| 60h | Okay to enter Setup utility; i.e. not until this POST stage can users enter the CMOS |
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| setup utility. |
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| 6 h | Reserved |
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| 6 h | Reserved |
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| 6 h | Reset keyboard if Early_Reset_KB is not defined |
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| 6 h | Reserved |
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| 6 h | Initialize PS/2 Mouse |
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| 6h | Reserved |
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| 67h | Prepare memory size information for function call: INT 15h ax=E820h |
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| 68h | Reserved |
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| 69h | Turn on L2 cache |
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| 6Ah | Reserved |
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| 6Bh | Program chipset registers according to items described in Setup & Auto- |
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| configuration table. |
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| 6Ch | Reserved |
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| 6Dh | 1 Assign resources to all ISA PnP devices. |
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| 2 Auto assign ports to onboard COM ports if the corresponding item in Setup is set |
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| to “AUTO”. |
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| 6Eh | Reserved |
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| 6Fh | 1 | Initialize floppy controller |
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| 2 Set up floppy related fields in 40:hardware |
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| 70h | Reserved |
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| 71h | Reserved |
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| 72h | Reserved |
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| 73h | Reserved |
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| 74h | Reserved |
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| 75h | Detect & install all IDE devices: HDD, LS120, ZIP, CDROM….. |
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64 | Chapter 4 |
