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4. Troubleshooting
38h
3Ah
3Ch
Advanced configuration of chipset registers
3Dh
Load alternate registers with CMOS values
42h
45h
46h
2-1-2-3
Check the ROM copyright notice
48h
Check the video configuration against CMOS
49h
4Ah
Initialize all video adapters on the system
4Bh
Quiet Boot start (optional)
4Ch
Shadow video BIOS ROM
4Eh
Display the BIOS copyright notice
50h
51h
52h
Test the keyboard
54h
58h
2-2-3-1
59h
5Ah
Display the prompt "Press F2 to enter SETUP"
5Bh
5Ch
Test RAM between 512 and 640 KB
60h
Test extended memory
62h
Test extended memory address lines
64h
Jump to UserPatch1
66h
Configure advanced cache registers
67h
68h
Enable external and CPU caches
69h
Setup System Management Mode (SMM) area
6Ah
Display external L2 cache size
6Bh
Load custom defaults (optional)
6Ch
Display shadow-area message
6Eh
Display possible high address for UMB recovery
70h
Display error messages
72h
Check for configuration errors
76h
Check for keyboard errors
7Ch
Set up hardware interrupt vectors
7Eh
Initialize coprocessor if present
80h
Disable onboard Super I/O ports and IRQs
81h
82h
Detect and install external RS232 ports
83h
Configure non-MCD IDE controllers
84h
Detect and install external parallel ports
85h
86h
Re-initialize onboard I/O ports.
87h
88h
89h
8Ah
Initialize Extended BIOS Data Area
Shadow system BIOS ROM
Auto size cache
Initialize interrupt vectors
POST device initialization
Initialize PCI bus and devices
Display the CPU type and speed
Initialize EISA board
Set key click if enabled
Test for unexpected interrupts
Initialize POST display service
Disable CPU cache
Initialize Multi Processor APIC
Late POST device initialization
Initialize PC-compatible PnP ISA devices
Configure Mothe board Configurable Devices
Initialize BIOS Data Area
Enable Non-Maskable Interrupts (NMIs)
4 - 5
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