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Power On Self-Tests
Checkpoint
code
42h
The descriptor tables are prepared. Entering protected mode for the memory test
next.
43h
Entered protected mode. Enabling interrupts for diagnostics mode next.
44h
Interrupts enabled if the diagnostics switch is on. Initializing data to check memory
wraparound at 0:0 next.
45h
Data initialized. Checking for memory wraparound at 0:0 and finding the total
system memory size next.
46h
The memory wraparound test has completed. The memory size calculation has
6
completed. Writing patterns to test memory next.
47h
The memory pattern was written to extended memory. Writing patterns to the base
640 KB memory next.
48h
Patterns written in base memory. Determining the amount of memory below 1 MB
next.
49h
The amount of memory below 1 MB was found and verified. Determining the
amount of memory above 1 MB memory next.
4Bh
The amount of memory above 1 MB was 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.
4Ch
The memory below 1 MB was cleared via a soft reset. Clearing the memory above 1
MB next.
4Dh
The memory above 1 MB was cleared via a soft reset. Saving the memory size next.
Going to checkpoint 52h next.
4Eh
The memory test started, but not as the result of a soft reset. Displaying the first 64
KB memory size next.
4Fh
The memory size display has started. The display is updated during the memory test.
Performing the sequential and random memory test next.
50h
The memory below 1 MB was tested and initialized. Adjusting the displayed
memory size for relocation and shadowing next.
51h
The memory size display was adjusted for relocation and shadowing. Testing the
memory above 1 MB next.
52h
The memory above 1 MB was tested and initialized. Saving the memory size
information next.
6-12
Table 6-6. Runtime checkpoint codes (Continued)
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