Appendix B
BIOS POST Codes
B-7
POST Code
Description
6Bh
Program chipset registers according to items described in Setup and
auto-configuration table.
6Ch
Reserved
6Dh
1. Assign resources to all ISA PnP devices.
2. Auto-assign ports to onboard COM ports if the corresponding item in
Setup is set to AUTO.
6Eh
Reserved.
6Fh
1. Initialize diskette controller.
2. Set up diskette-related fields in 40:hardware.
70h
Reserved.
71h
Reserved.
72h
Reserved.
73h
Reserved.
74h
Reserved.
75h
Detect and install all IDE devices: HDD, LS120, ZIP, CD-ROM, and so on.
76h
(Optional feature) Enter AWDFLASH.EXE if:
• AWDFLASH.EXE is in diskette drive.
• You press ALT+F2.
77h
Detect serial ports and parallel ports.
78h
Reserved.
79h
Reserved.
7Ah
Detect and install coprocessor.
7Bh
Reserved.
7Ch
Initialize HDD write-protect.
7Dh
Reserved.
7Eh
Reserved.
7Fh
Switch back to text mode if full screen logo is supported.
If errors occur, report errors and wait for keys
If no errors occur or F1 key is pressed to continue: Clear EPA or
customization logo.
80h
Reserved.
81h
Reserved.
TABLE B-1
BIOS Port 80 POST Codes
(Continued)
