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AMIBIOS POST Diagnostic Error Codes
When AMIBIOS performs the Power On Self Test, it writes diagnostic codes
checkpoint codes to I/O port 0080h. If the computer cannot complete the boot
process, diagnostic equipment can be attached to the computer to read I/O port
0080h.
B-1
Uncompressed Initialization Codes
The uncompressed initialization checkpoint codes are listed in order of execution:
Checkpoint
D0h
D1h
D3h
D4h
D5h
D6h
Appendix B: AMIBIOS POST Diagnostic Error Codes
Appendix B
Code Description
The NMI is disabled. Power on delay is starting. Next,
the initialization code checksum will be verified.
Initializing the DMA controller, performing the keyboard
controller BAT test, starting memory refresh, and
entering 4 GB flat mode next.
Starting memory sizing next.
Returning to real mode. Executing any OEM patches
and setting the Stack next.
Passing control to the uncompressed code in shadow
RAM at E000:0000h. The initialization code is copied to
segment 0 and control will be transferred to segment 0.
Control is in segment 0. Next, checking if <Ctrl> <Home>
was pressed and verifying the system BIOS
checksum. If either <Ctrl> <Home> was pressed or the
system BIOS checksum is bad, next will go to check
point code E0h.
Otherwise, going to checkpoint code D7h.
B-1
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