5 Power-On Self-Test and Error Messages

Order in Which the Tests are Performed

Checkpoint

POST Routine Description

Code

 

 

 

9Fh

Determine number of ATA and SCSI drives

 

 

A0h

Set time of day

 

 

A2h

Check key lock

 

 

A4h

Initialize typematic rate

 

 

A8h

Erase F2 prompt

 

 

AAh

Scan for F2 key stroke

 

 

ACh

Enter SETUP

 

 

AEh

Clear IN POST flag

 

 

B0h

Check for errors

 

 

B2h

POST done - prepare to boot operating system

 

 

B5H

Terminate QuietBoot

 

 

B6h

Check password (optional)

 

 

B8h

Clear global descriptor table

 

 

B9h

Clean up all graphics

 

 

BAh

Initialize DMI parameters

 

 

BBh

Initialize PnP Option ROMs

 

 

BCh

Clear parity checkers

 

 

BDh

Display MultiBoot menu

 

 

BEh

Clear screen optional

 

 

BFh

Check virus and backup reminders

 

 

C0h

Try to boot with INT 19

 

 

C1h

Initialize POST Error Manager (PEM)

 

 

C2h

Initialize error logging

 

 

C3h

Initialize error display function

 

 

C4h

Initialize system error handling

 

 

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