TYAN THUNDER K8QS Manual page 58

AEh Clear Boot flag
B0h Check for errors
B2h POST done - prepare to boot
operating system
B4h One short beep before boot
B5h Terminate QuietBoot (optional)
B6h Check password (optional)
B9h Prepare Boot
F2h
F3h
F4h
F5h
F6h
F7h
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Initialize video
Initialize System Management Mode
Output one beep before boot
Boot to Mini DOS
Clear Huge Segment
Boot to Full DOS