52
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Code
Beeps / Description
Code
Beeps / Description
7Eh
Initialize coprocessor if present
BAh
Initialize DMI parameters
80h
Disable onboard Super I/O ports
and IRQs
BBh
Initialize PnP Option ROMs
81h
Late POST device initialization
BCh
Clear parity checkers
82h
Detect and install external RS232
ports
BDh
Display MultiBoot menu
83h
Configure non-MCD IDE controllers
BEh
Clear screen (optional)
84h
Detect and install external parallel
ports
BFh
Check virus and backup reminders
85h
Initialize PC-compatible PnP ISA
devices
C0h
Try to boot with INT 19
86h.
Re-initialize onboard I/O ports.
C1h
Initialize POST Error Manager (PEM)
87h
Configure Motherboard Devices
C2h
Initialize error logging
88h
Initialize BIOS Data Area
C3h
Initialize error display function
89h
Enable Non-Maskable Interrupts
(NMIs)
C4h
Initialize system error handler
8Ah
Initialize Extended BIOS Data Area
C5h
PnPnd dual CMOS (optional)
8Bh
Test and initialize PS/2 mouse
C6h
Initialize notebook docking (optional)
8Ch
Initialize floppy controller
C7h
Initialize notebook docking late
8Fh
Determine number of ATA drives
(optional)
C8h Force
check
(optional)
90h
Initialize hard-disk controllers C9h
Extended
checksum
(optional)
91h
Initialize local-bus hard-disk
controllers
D2h Unknown
interrupt
92h
Jump to UserPatch2
E0h
Initialize the chipset
93h Build
MPTABLE
for
multi-processor
boards
E1h
Initialize the bridge
95h
Install CD ROM for boot
E2h
Initialize the CPU
96h
Clear huge ES segment register
E3h
Initialize system timer
97h
Fixup Multi Processor table
E4h
Initialize system I/O
98h
1-2. Search for option ROMs.
E5h
Check force recovery boot
99h
Check for SMART Drive (optional)
E6h
Checksum BIOS ROM
9Ah
Shadow option ROMs
E7h
Go to BIOS
9Ch
Set up Power Management
E8h
Set Huge Segment
9Dh
Initialize security engine (optional)
E9h
Initialize Multi Processor
9Eh
Enable hardware interrupts
EAh
Initialize OEM special code
9Fh
Determine number of ATA and
SCSI drives
EBh
Initialize PIC and DMA
A0h
Set time of day
ECh
Initialize Memory type
A2h
Check key lock
EDh
Initialize Memory size
A4h
Initialize Typematic rate
EEh
Shadow Boot Block
A8h
Erase F2 prompt
EFh
System memory test
AAh
Scan for F2 key stroke
F0h
Initialize interrupt vectors
ACh
Enter SETUP
F1h
Initialize Run Time Clock
AEh
Clear Boot flag
F2h
Initialize video
B0h
Check for errors
F3h
Initialize System Management Mode
B2h
POST done - prepare to boot
operating system
F4h
Output one beep before boot
B4h
One short beep before boot
F5h
Boot to Mini DOS
B5h
Terminate QuietBoot (optional)
F6h
Clear Huge Segment
B6h
Check password (optional)
F7h
Boot to Full DOS
B9h Prepare
Boot