HP P Class 450/500/550/600/650/700/750 Reference Manual page 108

Tests and Error Messages
Order in Which the Tests Are Performed
Checkpoint Code
58h
59h
5Ah
5Bh
5Ch
60h
62h
64h
66h
67h
68h
69h
6Ah
6Bh
6Ch
6Eh
70h
72h
76h
7Ch
7Eh
80h
81h
82h
83h
108
POST Routine Description
Test for unexpected interrupts
Initialize POST display service
Display prompt "Press F2 to enter SETUP"
Disable CPU cache
Test RAM between 512 and 640 KB
Test extended memory
Test extended memory address lines
Jump to UserPatch1
Configure advanced cache registers
Initialize Multi Processor APIC
Enable external and CPU caches
Setup System Management Mode (SMM) area
Display external L2 cache size
Load custom defaults (optional)
Display shadow-area message
Display possible high address for UMB recovery
Display error messages
Check for configuration errors
Check for keyboard errors
Set up hardware interrupt vectors
Initialize coprocessor if present
Disable onboard Super I/O ports and IRQs
Late POST device initialization
Detect and install external RS 232 ports
Configure non-MCD IDE controllers
Chapter 5