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70
1Ah
8237 DMA controller
initialization
54h
Set key click if enabled
1Ch
Reset Programmable Interrupt
Controller
58h
2-2-3-1. Test for unexpected
interrupts
20h
1-3-1-1. Test DRAM refresh
59h
Initialize POST display service
22h
1-3-1-3. Test 8742 KBD
Controller
5Ah
Display prompt "Press F2 to
enter SETUP"
24h
Set ES segment register to 4
GB
5Bh
Disable CPU cache
26h
Enable A20 line
5Ch
Test RAM between 512 and
640 KB
28h
Autosize DRAM
60h
Test extended memory
29h
Initialize POST Memory
Manager
62h
Test extended memory address
lines
2Ah
Clear 512 KB base RAM
64h
Jump to UserPatch1
2Ch
1-3-4-1. RAM failure on
address
66h
Configure advanced cache
registers
2Eh
1-3-4-3. RAM failure on data
bits of low byte of memory bus
67h
Initialize Multi Processor APIC
2Fh
Enable cache before system
BIOS shadow
68h
Enable external and CPU
caches
30h
1-4-1-1. RAM failure on data
bits of high byte of memory bus
69h
Setup System Management
Mode (SMM) area
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
C4h
Initialize system error handler