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| Appendix D: BIOS POST Checkpoint Codes | |
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Checkpoint | Beep Code | Description | |
Code | |||
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B0h |
| Check for errors | |
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| If (errors were found) | |
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| beep twice | |
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| display "F1 or F2" message | |
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| if (F2 keystroke) go to SETUP | |
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| if (F1 keystroke) go to BOOT | |
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B1h |
| Inform RomPilot about the end of POST. | |
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B2h |
| Change status bits in CMOS and/or the BIOS | |
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| data area to reflect the fact that POST is | |
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| complete. | |
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B4h |
| One quick beep. | |
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B5h |
| Turn off <Esc> and <F2> key checking. | |
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| IF (VGA adapter is present) | |
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| IF (OEM screen is still up) | |
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| Note OEM screen is gone. | |
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| Fade out OEM screen. | |
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| Reset video: clear screen, reset cursor, | |
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| reload | |
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| DAC. | |
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| ENDIF | |
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| ENDIF | |
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B6h |
| If password on boot is enabled, a call is | |
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| made to Setup to check password. If the | |
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| user does not enter a valid password, Setup | |
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| does not return. | |
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B7h |
| Initialize ACPI BIOS. | |
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B9h |
| Clear all screen graphics before booting. | |
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BAh |
| Initialize the SMBios header and | |
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| tures. | |
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BCh |
| Clear | |
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BDh |
| Display Boot First menu if MultiBoot is | |
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| intstalled. | |
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