| Code | Beeps | POST Routine Description |
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| 8Fh |
| Determine number of ATA drives (optional) |
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| 90h |
| Initialize |
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| 91h |
| Initialize |
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| 92h |
| Jump to UserPatch2 |
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| 93h |
| Build MPTABLE for |
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| 95h |
| Install CD ROM for boot |
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| 96h |
| Clear huge ES segment register |
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| 97h |
| Fixup Multi Processor table |
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| 98h | Search for option ROMs. One long, two short |
| |
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| beeps on checksum failure. |
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| 99h |
| Check for SMART drive (optional) |
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| 9Ah |
| Shadow option ROMs |
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| 9Ch |
| Set up Power Management |
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| 9Dh |
| Initialize security engine (optional) |
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| 9Eh |
| Enable hardware interrupts |
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| 9Fh |
| Determine number of ATA and SCSI drives |
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| A0h |
| Set time of day |
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| A2h |
| Check key lock |
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| A4h |
| Initialize Typematic rate |
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| A8h |
| Erase F2 prompt |
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| AAh |
| Scan for F2 key stroke |
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| ACh |
| Enter SETUP |
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| AEh |
| Clear Boot flag |
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| B0h |
| Check for errors |
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| B2h |
| POST done- prepare to boot operating system |
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| B4h | 1 | One short beep before boot |
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| B5h |
| Terminate QuietBoot (optional) |
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| B6h |
| Check password (optional) |
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| B9h |
| Prepare Boot |
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| BAh |
| Initialize DMI parameters |
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| BBh |
| Initialize PnP Option ROMs |
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| BCh |
| Clear parity checkers |
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| BDh |
| Display MultiBoot menu |
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| BEh |
| Clear screen (optional) |
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| BFh |
| Check virus and backup reminders |
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| C0h |
| Try to boot with INT 19 |
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| C1h |
| Initialize POST Error Manager (PEM) |
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| C2h |
| Initialize error logging |
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| C3h |
| Initialize error display function |
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| C4h |
| Initialize system error handler |
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| C5h |
| PnPnd dual CMOS (optional) |
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| C6h |
| Initialize notebook docking (optional) |
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| C7h |
| Initialize notebook docking late |
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| C8h |
| Force check (optional) |
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| C9h |
| Extended checksum (optional) |
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| D2h |
| Unknown interrupt |
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72 | Chapter 4 |