Technical data

Troubleshooting
4-40
Code Description
90h Initialize hard-disk controller
91h Initialize local-bus hard-disk controller
92h Jump to UserPatch2
93h Build the MPTABLE for multi-processor cards
94h Disable A20 address line.
95h Initialize bootable CD-ROM
96h Clear huge ES segment register
97h Create pointer to MP table in Extended BDA
98h Search for option ROMs - One long, two short beeps on checksum failure
9Ah Shadow option ROMs
9Ch Set up Power Management
9Eh Enable hardware interrupts
9Fh Check the total number of Fast Disks (ATA and SCSI)
A0h Set time of day
A2h Check Numlock
A4h Initialize typematic rate
A8h Erase "Press F2 for Setup" prompt
AAh Scan for F2 keystroke
ACh Enter SETUP if F2 was pressed
AEh Clear in-POST flag
B0h Check for errors
B2h POST done - prepare to boot operating system
B4h One short beep before boot
B5h Clear QuietBoot screen
B6h Check password (optional)
B8h Clear global descriptor table
BAh Initialize Desktop Management Interface (DMI)
BCh Clear parity checkers
BDh If MultiBoot is installed, display Boot First menu
continued