| Code |
Meaning |
| 02 |
Verify
real mode |
| 03 |
Disable
non-maskable interrupt (NMI) |
| 04 |
Get
CPU type |
| 06 |
Initialize
system hardware |
| 07 |
Disable
shadow and execute code from the ROM |
| 08 |
Initialize
chipset with initial POST values |
| 09 |
Set
IN POST flag |
| 0A |
Initialize
CPU registers |
| 0B |
Enable
CPU cache |
| 0C |
Initialize
caches to initial POST values |
| 0E |
Initialize
I/O component |
| 0F |
Initialize
the local bus IDE |
| 10 |
initialize
power management |
| 11 |
Load
alternate registers with initial POST values |
| 12 |
Restore
CPU control word during warm boot |
| 13 |
Initialize
PCI bus mastering devices |
| 14 |
Initialize
keyboard controller |
| 16 |
BIOS
ROM checksum |
| 17 |
Initialize
cache before memory autosize |
| 18 |
8254
programmable interrupt timer initialization |
| 1A |
8237
DMA controller initialization |
| 1C |
Reset
programmable interrupt controller |
| 20 |
Test
DRAM refresh |
| 22 |
Test
8742 keyboard controller |
| 24 |
Set
ES segment register to 4GB |
| 26 |
Enable
gate A20 line |
| 28 |
Autosize
DRAM |
| 29 |
Initialize
POST memory manager |
| 2A |
Clear
512KB base RAM |
| 2C |
RAM
failure on address line xxxx |
| 2E |
RAM
failure on data bits xxxx of low byte of memory
bus |
| 2F |
Enable
cache before system BIOS shadow |
| 30 |
RAM
failure on data bits xxxx of high byte of memory
bus |
| 32 |
Test
CPU bus clock frequency |
| 33 |
Initialize
Phoenix Dispatch Manager |
| 36 |
Warm
start shut down |
| 38 |
Shadow
system BIOS ROM |
| 3A |
Autosize
cache |
| 3C |
Advanced
configuration of chipset registers |
| 3D |
Load
alternate registers with CMOS values |
| 41 |
Initialize
extended memory for RomPilot |
| 42 |
Initialize
interrupt vectors |
| 45 |
POST
device initialization |
| 46 |
Check
ROM copyright notice |
| 47 |
Initialize
I20 support |
| 48 |
Check
video configuration against CMOS |
| 49 |
Initialize
PCI bus and devices |
| 4A |
Initialize
all video adapters in system |
| 4B |
QuietBoot
start (optional) |
| 4C |
Shadow
video BIOS ROM |
| 4E |
Display
BIOS copyright notice |
| 4F |
Initialize
MultiBoot |
| 50 |
Display
CPU type and speed |
| 51 |
Initialize
EISA board |
| 52 |
Test
keyboard |
| 54 |
Set
key click if enabled |
| 55 |
Enable
USB devices |
| 58 |
Test
for unexpected interrupts |
| 59 |
Initialize
POST display service |
| 5A |
Display
prompt "Press F2 to enter SETUP" |
| 5B |
Disable
CPU cache |
| 5C |
Test
RAM between 512KB and 640KB |
| 60 |
Test
extended memory |
| 62 |
Test
extended memory address lines |
| 64 |
Jump
to UserPatch1 |
| 66 |
Configure
advanced cache registers |
| 67 |
Initialize
Multi Processor APIC |
| 68 |
Enable
external and CPU caches |
| 69 |
Setup
system management mode (SMM) area |
| 6A |
Display
external L2 cache size |
| 6B |
Load
custom defaults (optional) |
| 6C |
Display
shadow area message |
| 6E |
Display
possible high address for UMB recovery |
| 70 |
Display
error messages |
| 72 |
Check
for configuration errors |
| 76 |
Check
for keyboard errors |
| 7C |
Set
up hardware interrupt vectors |
| 7D |
Initialize
Intelligent System Monitoring |
| 7E |
Initialize
coprocessor if present |
| 80 |
Disable
onboard super I/O ports and IRQ's |
| 81 |
Late
POST device initialization |
| 82 |
Detect
and install external RS232 ports |
| 83 |
Configure
non-MCD IDE controllers |
| 84 |
Detect
and install external parallel ports |
| 85 |
Initialize
PC compatible PnP ISA devices |
| 86 |
Reinitialize
onboard I/O ports |
| 87 |
Configure
motherboard configurable devices (optional) |
| 88 |
Initialize
BIOS data area |
| 89 |
Enable
non-maskable interrupts (NMI's) |
| 8A |
Initialize
extended BIOS data area |
| 8B |
Test
and initialize PS/2 mouse |
| 8C |
Initialize
floppy controller |
| 8F |
Determine
number of ATA drives (optional) |
| 90 |
Initialize
hard disk controllers |
| 91 |
Initialize
local bus hard disk controllers |
| 92 |
Jump
to UserPatch2 |
| 93 |
Build
MPTABLE for multi processor boards |
| 95 |
Install
CD ROM for boot |
| 96 |
Clear
huge ES segment register |
| 97 |
Fixup
multi processor table |
| 98 |
Search
for option ROM's |
| 99 |
Check
for SMART drive (optional) |
| 9A |
Shadow
option ROM's |
| 9C |
Set
up power management |
| 9D |
Initialize
security engine (optional) |
| 9E |
Enable
hardware interrupts |
| 9F |
Determine
number of ATA and SCSI drives |
| A0 |
Set
time of day |
| A2 |
Check
key lock |
| A4 |
Initialize
typematic rate |
| A8 |
Erase
F2 prompt |
| AA |
Scan
for F2 key stroke |
| AC |
Enter
setup |
| AE |
Clear
boot flag |
| B0 |
Check
for errors |
| B1 |
Inform
RomPilot about the end of POST |
| B2 |
POST
done - prepare to boot operating system |
| B4 |
One
short beep |
| B5 |
Terminate
QuietBoot (optional) |
| B6 |
Check
password |
| B7 |
Initialize
ACPI BIOS |
| B9 |
Prepare
boot |
| BA |
Initialize
DMI parameters |
| BB |
Initialize
PnP option ROM's |
| BC |
Clear
parity checkers |
| BD |
Display
multiboot menu |
| BE |
Clear
screen |
| BF |
Check
virus and backup reminders |
| C0 |
Try
to boot with interrupt 19 |
| C1 |
Initialize
POST Error Manager (PEM) |
| C2 |
Initialize
error logging |
| C3 |
Initialize
error display function |
| C4 |
Initialize
system error handler |
| C5 |
PnP
dual CMOS (optional) |
| C6 |
Initialize
notebook docking (optional) |
| C7 |
Initialize
notebook docking late |
| C8 |
Force
check (optional) |
| C9 |
Extended
checksum (optional) |
| CA |
Redirect
Int 15h to enable remote keyboard |
| CB |
Redirect
Int 13 to Memory Technologies Devices such as ROM, RAM,
PCMCIA, and serial disk |
| CC |
Redirect
Int 10h to enable remote serial video |
| CD |
Re-map
I/O and memory for PCMCIA |
| CE |
Initialize
digitizer and dispaly message |
| D2 |
Unknown
interrupt |
| |
The
following are for boot block in Flash ROM |
| E0 |
Initialize
the chipset |
| E1 |
Initialize
the bridge |
| E2 |
Initialize
the CPU |
| E3 |
Initialize
the system timer |
| E4 |
Initialize
system I/O |
| E5 |
Check
force recovery boot |
| E6 |
Checksum
BIOS ROM |
| E7 |
Go
to BIOS |
| E8 |
Set
Huge Segment |
| E9 |
Initialize
Multi Processor |
| EA |
Initialize
OEM special code |
| EB |
initialize
PIC and DMA |
| EC |
Initialize
Memory type |
| ED |
Initialize
Memory size |
| EE |
Shadow
Boot Block |
| EF |
System
memory test |
| F0 |
Initialize
interrupt vectors |
| F1 |
Initialize
Run Time Clock |
| F2 |
Initialize
video |
| F3 |
Initialize
System Management Menager |
| F4 |
Output
one beep |
| F5 |
Clear
Huge Segement |
| F6 |
Boot
to mini DOS |
| F7 |
Boot
to Full DOS |
