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Code
Beeps
C3h
C4h
C5h
C6h
C7h
C8h
C9h
D2h
Code
Beeps
E0h
E1h
E2h
E3h
E4h
E5h
E6h
E7h
E8h
E9h
EAh
EBh
ECh
EDh
EEh
EFh
F0h
F1h
F2h
F3h
F4h
1
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. Note that error 30
cannot occur on 386SX systems because they have a 16 rather than 32-bit bus. The BIOS also sends the
bitmap to the port-80 LED display. It first displays the check point code, followed by a delay, the high-order
byte, another delay, and then the low-order byte of the error. It repeats this sequence continuously.
144
POST Routine Description
Initialize error display function
Initialize system error handler
PnPnd dual CMOS (optional)
Initialize notebook docking (optional)
Initialize notebook docking late
Force check (optional)
Extended checksum (optional)
Unknown interrupt
For Boot Block in Flash ROM
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 Mode
Output one beep before boot
Boot to Mini DOS
Clear Huge Segment
Boot to Full DOS
Chapter 4
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