HP X Class 500/550MHz Reference Manual page 126

Tests and Error Messages
Order in Which the Tests Are Performed
Checkpoint Code
A4h
A8h
AAh
ACh
AEh
B0h
B2h
B5H
B6h
B8h
B9h
BAh
BBh
BCh
BDh
BEh
BFh
C0h
C1h
C2h
C3h
C4h
E0h
E1h
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POST Routine Description
Initialize typematic rate
Erase F2 prompt
Scan for F2 key stroke
Enter SETUP
Clear IN POST flag
Check for errors
POST done - prepare to boot operating system
Terminate QuietBoot
Check password (optional)
Clear global descriptor table
Clean up all graphics
Initialize DMI parameters
Initialize PnP Option ROMs
Clear parity checkers
Display MultiBoot menu
Clear screen optional
Check virus and backup reminders
Try to boot with INT 19
Initialize POST Error Manager (PEM)
Initialize error logging
Initialize error display function
Initialize system error handling
The following are for boot block in Flash ROM
Initialize the chipset
Initialize the bridge
Chapter 5