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POST Code
CBh
CCh
CDh
CEh
D2h
The following are for boot block in Flash ROM
POST Code
E0h
E1h
E2h
E3h
E4h
E5h
E6h
E7h
E8h
E9h
EAh
EBh
ECh
EDh
EEh
EFh
F0h
F1h
F2h
F3h
F4h
F5h
F6h
F7h
* If the BIOS detects error 2C, 2E, or 30 (base 512K RAM error), it displays an additional
word-bitmap ( xxxx ) indicating the address line or bits that failed. For example, "2C 0002"
means address line 1 (bit one set) has failed. "2E 1020" means data bits 12 and 5 (bits
12 and 5 set) have failed in the lower 16 bits. The BIOS also sends the bitmap to the port-
80 LED display. It first displays the checkpoint code, followed by a delay, the high-order
byte, another delay, and then the loworder byte of the error. It repeats this sequence
continuously.
Description
Redirect Int 13h to Memory Technologies
Devices such as ROM, RAM, PCMCIA, and
serial disk
Redirect Int 10h to enable remote serial video
Re-map I/O and memory for PCMCIA
Initialize digitizer and display message
Unknown interrupt
Description
Initialize the chipset
Initialize the bridge
Initialize the CPU
Initialize system timer
Initialize system I/O
Check force recovery boot
Checksum BIOS ROM
Go to BIOS
Set Huge Segment
Initialize Multi Processor
Initialize OEM special code
Initialize PIC and DMA
Initialize Memory type
Initialize Memory size
Shadow Boot Block
System memory test
Initialize interrupt vectors
Initialize Run Time Clock
Initialize video
Initialize System Management Manager
Output one beep
Clear Huge Segment
Boot to Mini DOS
Boot to Full DOS
Appendix B: BIOS POST Codes
B-5
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