Intel AN430TX - Motherboard - ATX Technical Product Specification page 77

Table 44. Port 80h Codes (continued)
Code Description of POST Operation Currently In Progress
EEh Shadow Boot Block
EFh System memory test
F0h Initialize interrupt vectors
F1h Initialize Run Time Clock
F2h Initialize video
F3h Initialize beeper
F4h Initialize boot
F5h Clear Huge segment
F6h Boot to Mini DOS
F7h Boot to Full DOS
Error Messages
77