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Appendix B BIOS POST Codes
B-3
41 Initialize extended memory for RomPilot
42 Initialize interrupt vectors
45 POST device initialization
46 Check ROM copyright notice
47 Initialize I20 support
48 Check video configuration against CMOS
49 Initialize PCI bus and devices
4A Initialize all video adapters in system
4B QuietBoot start (optional)
4C Shadow video BIOS ROM
4E Display BIOS copyright notice
4F Initialize MultiBoot
50 Display CPU type and speed
51 Initialize EISA board
52 Test keyboard
54 Set key click if enabled
55 Enable USB devices
58 Test for unexpected interrupts
59 Initialize POST display service
5A Display prompt “Press F2 to enter SETUP”
5B Disable CPU cache
5C Test RAM between 512KB 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 Set up system management mode (SMM) area
6A Display external L2 cache size
TABLE B-1
BIOS POST Codes
(Continued)
Post Code Description