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Chapter 10 Solving Problems
Table 10-2. Port-80 Codes (continued)
Port 80 Code Reason
40 Set Initial CPU speed new
42 Initialize interrupt vectors
44 Initialize BIOS interrupts
46 Check ROM copyright notice
47 Initialize manager for PCI Option ROMs
48 Check video configuration against CMOS
49 Initialize PCI bus and devices
4A Initialize all video adapters in system
4B Display QuietBoot screen
4C Shadow video BIOS ROM
4E Display copyright notice
50 Display CPU type and speed
51 Initialize EISA board
52 Test keyboard
54 Set key click if enabled
56 Enable keyboard
58 Test for unexpected interrupts
5A Display prompt "Press F2 to enter SETUP"
5C Test RAM between 512 and 640k
60 Test extended memory
62 Test extended memory address lines
64 Jump to UserPatch1
66 Configure advanced cache registers
Continued