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Checkpoint
43h
44h
45h
46h
47h
48h
49h
4Bh
4Ch
4Dh
4Eh
4Fh
50h
51h
52h
53h
Appendix B: AMIBIOS POST Diagnostic Error Codes
Code Description
Entered protected mode. Enabling interrupts for
diagnostics mode next.
Interrupts enabled if the diagnostics switch is on.
Initializing data to check memory wraparound at 0:0
next.
Data initialized. Checking for memory wraparound at
0:0 and finding the total system memory size next.
The memory wraparound test is done. Memory size
calculation has been done. Writing patterns to test
memory next.
The memory pattern has been written to extended
memory. Writing patterns to the base 640 KB memory
next.
Patterns written in base memory. Determining the
amount of memory below 1 MB next.
The amount of memory below 1 MB has been found
and verified. Determining the amount of memory above
1 MB memory next.
The amount of memory above 1 MB has been found
and verified. Checking for a soft reset and clearing the
memory below 1 MB for the soft reset next. If this is a
power on situation, going to checkpoint 4Eh next.
The memory below 1 MB has been cleared via a soft
reset. Clearing the memory above 1 MB next.
The memory above 1 MB has been cleared via a soft
reset. Saving the memory size next. Going to check
point 52h next.
The memory test started, but not as the result of a soft
reset. Displaying the first 64 KB memory size next.
The memory size display has started. The display is
updated during the memory test. Performing the
sequential and random memory test next.
The memory below 1 MB has been tested and
initialized. Adjusting the displayed memory size for
relocation and shadowing next.
The memory size display was adjusted for relocation
and shadowing. Testing the memory above 1 MB next.
The memory above 1 MB has been tested and
initialized. Saving the memory size information next.
The memory size information and the CPU registers are
saved. Entering real mode next.
B-5
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