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BIOS PostCodes

Intel Motherboards:

Intel SE440BX-2 BIOS Post Codes:

02 Verify real mode
03 Disable non maskable interrupts (NMIs)
04 Get processor type
06 Initialize system hardware
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 valuesnew
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 timer initialization
1A 8237 DMA controller initialization
1C Reset programmable interrupt controller
20 Test DRAM refresh
22 Test keyboard controller
24 Set ES segment register to 4GB
26 Enable 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 POST dispatch manager
34 Test CMOS RAM
35 Initialize alternate chipset registers
36 Warm start shut down
37 Reinitialize the chipset (motherboard only)
38 Shadow system BIOS ROM
39 Reinitialize the cache (motherboard only)
3A Autosize cache
3C Configure advanced chipset registers
3D Load alternate registers with CMOS valuesnew
40 Set initial CPU speed new
42 Initialize interrupt vectors
44 Initialize BIOS interrupts
45 POST device initialization
46 Check ROM copyright notice
47 Initialize manager for PCI option ROMs
48 Check video configuration against CMOS RAM data
49 Initialize PCI bus and devices
4A Initialize all video adapters in system
4B Display QuietBoot screen
4C Shadow video BIOS ROM
4E Display BIOS copyright notice
50 Display CPU type and speed
51 Initialize EISA motherboard
52 Test keyboard
54 Set key click if enabled
56 Enable keyboard
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 512 KB and 640 KB
60 Test extended memory
62 Test extended memory address lines
64 Jump to UserPatch 1
66 Configure advanced cache registers
67 Initialize multiprocessor APIC
68 Enable external and processor caches
69 Setup System Management Mode (SMM)
6A Display external L2 cache size
6C Display shadow area message
6E Display possible high address for UMB recovery
70 Display error messages
72 Check for configuration errors
74 Test real time clock
76 Check for keyboard errors
7A Test for key lock on
7C Setup hardware interrupt vectors
7E Initialize coprocessor if present
80 Disable onboard Super I/O ports and IRQs
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
88 Initialize BIOS Data Area
89 Enable non maskable interrupts
8A Initialize extended BIOS Data Area
8B Test and initialize PS/2 mouse
8C Initialize floppy controller
8F Determine number of ATA drives
90 Initialize hard disk controllers
91 Initialize local bus hard disk controllers
92 Jump to UserPatch 2
93 Build MPTABLE for multiprocessor boards
94 Disable A20 address line
95 Install CD-ROM for boot
96 Clear huge ES segment register
97 Fix up multiprocessor table
98 Search for option ROMs
99 Check for SMART drives
9A Shadow option ROMs
9C Setup power management
9E Enable hardware interrupts
9F Determine number of ATA and SCSI drives
A0 Set time of day
A2 Check key lock
A4 Initialize typmatic rate
A8 Erase F2 prompt
AA Scan for F2 keystroke
AE Clear IN POST flag
B0 Check for errors
B2 POST done - prepare to boot operating system
B4 One short beep before boot
B5 Terminate QuietBoot
B6 Check password (optional)
B8 Clear global descriptor table
B9 Clean up all graphics
BA Initialize DMI parameters
BB Initialize PnP option ROMs
BC Clear parity checkers
BD Display MultiBoot menu
BE Clear screen (optional)
BF Check virus and backup reminders
C0 Try to boot with INT 19h
C1 Initialize POST Error Manager (PEM)
C2 Initialize error logging
C3 Initialize error display function
C4 Initialize system error handler
E0 Initialize the chipset
E1 Initialize the bridge
E2 Initialize the processor
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 multiprocessor
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 size
F0 Initialize interrupt vectors
F1 Initialize runtime clock
F2 Initialize video
F3 Initialize beeper
F4 Initialize boot
F5 Clear huge segment
F6 Boot to mini-DOS
F7 Boot to full DOS


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