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A: BIOS Power-on Self Test
A-152
Table A-1
BIOS Post Codes (continued)
POST Code (hex) Description
4C
Shadow video BIOS ROM
4E
Display BIOS copyright notice
4F
Initialize MultiBoot
50
Display CPU type and speed
51
Initialize EISA board (optional)
52
Test keyboard
54
Set key click if enabled
55
Enable USB devices
58
2-2-3-1 Test for unexpected interrupts
59
Initialize POST display service
5A
Display prompt "Press <ESC> to enter SETUP"
5B
Disable CPU cache
5C
Test RAM between 512 and 640kB
60
Test extended memory
62
Test extended memory address lines
64
Jump to UserPatch1
66
Configure advanced cache registers
67
Initialize Multi Processor APIC
68
Enable external and CPU caches
69
Setup System Management Mode (SMM) area
6A
Display external L2 cache size
6B
Load custom defaults (optional)
6C
Display shadow-area message
70
Display error messages
007-4960-004
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