6 Tests and Error Messages

Order in Which POST Tests Are Performed

Checkpoint

 

MaxiLife LCD

Beep

POST Routine Description

Display

Code

Codes

 

Message

 

 

 

 

 

 

 

F2h

Initialize video

 

 

 

 

 

 

F3h

Initialize System Management Mode

 

 

 

 

 

 

F4h

Output one beep before boot

 

 

 

 

 

 

F5h

Boot to Mini DOS

 

 

 

 

 

 

F6h

Clear Huge Segment

 

 

 

 

 

 

F7h

Boot to Full DOS

 

 

 

 

 

 

1.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 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 low-order byte of the error. It repeats this sequence continuously.

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