Appendix B: BIOS POST Codes
B-5
POST Code Description
A8h
Erase <ESC> prompt
AAh
Scan for <ESC> key stroke
ACh
Enter SETUP
AEh
Clear Boot flag
B0h
Check for errors
B1h
Inform RomPilot about the end of POST (optional)
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 and PPM Structures
B9h
Prepare Boot
BAh
Initialize SMBIOS
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 flags
C6h
Console redirection init.
C7h
Unhook INT 10h if console redirection enabled
C8h
Force check (optional)
C9h
Extended ROM checksum (optional)
CDh
Reclaim console redirection vector
D2h
Unknown interrupt
D4h
Check Intel Branding string
D8h
Alert Standard Format initialization
D9h
Late init for IPMI
DEh
Log error if micro-code not updated properly
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