Code | Beeps | POST Routine Description |
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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E0h |
| Initialize the chipset |
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E1h |
| Initialize the bridge |
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E2h |
| Initialize the CPU |
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E3h |
| Initialize the system timer |
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E4h |
| Initialize system I/O |
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E5h |
| Check force recovery boot |
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E6h |
| Checksum BIOS ROM |
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E7h |
| Go to BIOS |
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E8h |
| Set Huge Segment |
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E9h |
| Initialize Multi Processor |
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EAh |
| Initialize OEM special code |
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EBh |
| Initialize PIC and DMA |
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ECh |
| Initialize Memory type |
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EDh |
| Initialize Memory size |
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EEh |
| Shadow Boot Block |
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EFh |
| System memory test |
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F0h |
| Initialize interrupt vectors |
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F1h |
| Initialize Run Time Clock |
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F2h |
| Initialize video |
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F3h |
| Initialize System Management Mode |
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F4h | 1 | Output one beep before boot |
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F5h |
| Boot to Mini DOS |
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F6h |
| Clear Huge Segment |
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F7h |
| Boot to Full DOS |
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68 | Chapter 4 |