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Code | Beeps | POST Routine Description |
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96h |
| Clear huge ES segment register |
97h |
| Fixup Multi Processor table |
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98h | Search for option ROMs. One long, two short 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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Code | Beeps | For Boot Block in Flash ROM |
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E0h |
| Initialize the chipset |
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E1h |
| Initialize the bridge |
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Chapter 4 | 155 |