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POST
DESCRIPTION
CODE
30
The display memory Read/Write test passed. About to look for the retrace
checking.
31
Display memory R/W test or retrace checking failed. Performing the alternate
display memory Read/Write test next.
32
The alternate display memory Read/Write test passed. About to look for the
alternate display retrace checking.
34
Video display checking over. The display mode will be set next.
37
Display mode set. Going to display the power on message.
38
Different BUSes initialization (input, IPL, general devices) to begin, if present.
See section E.02 for details of different BUSes.
39
Display different BUSes initialization error messages. See section E.02 for
details of different BUSes.
3A
New cursor position read and saved. Going to display the Hit <DEL> message.
3B
The Hit <DEL> message has been displayed. The virtual mode memory test is
about to begin.
40
Going to prepare the descriptor tables.
42
The descriptor tables have been prepared. Entering virtual mode for the
memory test next.
43
Entered virtual mode. Enabling interrupts for diagnostics mode next.
44
Interrupts enabled (if the diagnostics switch is on). Going to initialize data to
check memory wrap around at 0:0h.
45
Data initialized. Checking for memory wraparound at 0:0h and finding the
total system memory size.
46
Memory wrap around test done. Memory size calculation over. Writing patterns
in memory to test memory next.
47
Pattern to be tested written in extended memory. Going to write patterns in base
640KB memory.
48
Patterns written in base memory. Determining the amount of memory below
1MB memory.
49
Amount of memory below 1MB found and verified. Determining the amount of
memory above 1 MB memory.
4B
Amount of memory above 1MB found and verified. Checking for soft reset and
clearing the memory below 1MB for a soft reset. (If at power on, go to check-
point 4Eh).
4C
Memory below 1MB cleared. Next, doing a soft reset to clear memory above
1MB.
4D
Memory above 1MB cleared via a soft reset. Saved the memory size. Going to
check-point 52h next.
Post Codes & Error Codes
F-4
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