| Code | Beeps | POST Routine Description |
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| 8Bh |
| Test and initialize PS/2 mouse |
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| 8Ch |
| Initialize floppy controller |
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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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|
|
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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) |
|
|
|
|
|
|
| 9Ah |
| Shadow option ROMs |
|
|
|
|
|
|
| 9Ch |
| Set up Power Management |
|
|
|
|
|
|
| 9Dh |
| Initialize security engine (optional) |
|
|
|
|
|
|
| 9Eh |
| Enable hardware interrupts |
|
|
|
|
|
|
| 9Fh |
| Determine number of ATA and SCSI drives |
|
|
|
|
|
|
| A0h |
| Set time of day |
|
|
|
|
|
|
| A2h |
| Check key lock |
|
|
|
|
|
|
| A4h |
| Initialize Typematic rate |
|
|
|
|
|
|
| A8h |
| Erase F2 prompt |
|
|
|
|
|
|
| AAh |
| Scan for F2 key stroke |
|
|
|
|
|
|
| ACh |
| Enter SETUP |
|
|
|
|
|
|
| AEh |
| Clear Boot flag |
|
|
|
|
|
|
| B0h |
| Check for errors |
|
|
|
|
|
|
| B1h |
| Inform RomPilot about the end of POST. |
|
|
|
|
|
|
| B2h |
| POST done- prepare to boot operating system |
|
|
|
|
|
|
| B4h | 1 | One short beep before boot |
|
|
|
|
|
|
| B5h |
| Terminate QuietBoot (optional) |
|
|
|
|
|
|
| B6h |
| Check password (optional) |
|
|
|
|
|
|
| B7h |
| Initialize ACPI BIOS |
|
|
|
|
|
|
| B9h |
| Prepare Boot |
|
|
|
|
|
|
| BAh |
| Initialize SMBIOS |
|
|
|
|
|
|
| BBh |
| Initialize PnP Option ROMs |
|
|
|
|
|
|
| BCh |
| Clear parity checkers |
|
|
|
|
|
|
| BDh |
| Display MultiBoot menu |
|
|
|
|
|
|
| BEh |
| Clear screen (optional) |
|
|
|
|
|
|
| BFh |
| Check virus and backup reminders |
|
|
|
|
|
|
| C0h |
| Try to boot with INT 19 |
|
|
|
|
|
|
| C1h |
| Initialize POST Error Manager (PEM) |
|
|
|
|
|
|
| C2h |
| Initialize error logging |
|
|
|
|
|
|
| C3h |
| Initialize error display function |
|
|
|
|
|
|
| C4h |
| Initialize system error handler |
|
|
|
|
|
|
| C5h |
| PnPnd dual CMOS (optional) |
|
|
|
|
|
|
| C6h |
| Initialize notebook docking (optional) |
|
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|
90 | Chapter 4 |
