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Code Beeps / Description Code Beeps / Description
6Ah Display external L2 cache size A2h Check key lock
6Bh Load custom defaults (optional) A4h Initialize Typematic rate
6Ch Display shadow-area message A8h Erase F2 prompt
6Eh Display possible high address
for UMB recovery
AAh Scan for F2 key stroke
70h Display error messages ACh Enter SETUP
72h Check for configuration errors AEh Clear Boot flag
76h Check for keyboard errors B0h Check for errors
7Ch Set up hardware interrupt
vectors
B2h POST done - prepare to boot
operating system
7Eh Initialize coprocessor if present B4h One short beep before boot
80h Disable onboard Super I/O
ports and IRQs
B5h Terminate QuietBoot (optional)
81h Late POST device initialization B6h Check password (optional)
82h Detect and install external
RS232 ports
B9h Prepare Boot
83h Configure non-MCD IDE
controllers
BAh Initialize DMI parameters
84h Detect and install external
parallel ports
BBh Initialize PnP Option ROMs
85h Initialize PC-compatible PnP
ISA devices
BCh Clear parity checkers
86h. Re-initialize onboard I/O ports. BDh Display MultiBoot menu
87h Configure Motherboard Devices BEh Clear screen (optional)
88h Initialize BIOS Data Area BFh Check virus and backup
reminders
89h Enable Non-Maskable
Interrupts (NMIs)
C0h Try to boot with INT 19
8Ah Initialize Extended BIOS Data
Area
C1h Initialize POST Error Manager
(PEM)
8Bh Test and initialize PS/2 mouse C2h Initialize error logging
8Ch Initialize floppy controller C3h Initialize error display function
8Fh Determine number of ATA
drives (optional)
C4h Initialize system error handler
90h Initialize hard-disk controllers C5h PnPnd dual CMOS (optional)
91h Initialize local-bus hard-disk
controllers
C6h Initialize notebook docking
(optional)
92h Jump to UserPatch2 C7h Initialize notebook docking late
93h Build MPTABLE for multi-
processor boards
C8h Force check (optional)
95h Install CD ROM for boot C9h Extended checksum (optional)
96h Clear huge ES segment
register
D2h BIOS Boot Block
97h Fixup Multi Processor table E0h BIOS Boot Block
98h 1-2. Search for option ROMs. E1h BIOS Boot Block
99h Check for SMART Drive
(optional)
E2h Initialize the CPU
9Ah Shadow option ROMs E3h Initialize system timer
9Ch Set up Power Management E4h Initialize system I/O
9Dh Initialize security engine
(optional)
E5h Check force recovery boot
9Eh Enable hardware interrupts E6h Checksum BIOS ROM
9Fh Determine number of ATA and
SCSI drives
E7h Go to BIOS
A0h Set time of day E8h Set Huge Segment
Code Beeps / Description Code Beeps / Description