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Appendix D: Industrial Devices
61
Checkpoint
Code
Description
37h
The display mode is set. Displaying the power on
message next.
38h
Initializing the bus input, IPL, general devices next, if
present. See Table D-7 for additional information.
39h
Displaying bus initialization error messages. See Table
D-7 for additional information.
3Ah
The new cursor position has been read and saved.
Displaying the Hit <DEL> message next.
3Bh
The Hit <DEL> message is displayed. The protected
mode memory test is about to start.
40h Preparing the descriptor tables next.
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 is done. Memory size
calculation has been done. Writing patterns to test
memory next.
47h
The memory pattern has been 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 has been found and
verified. Determining the amount of memory above 1
MB memory next.
4Bh
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.
4Ch
The memory below 1 MB has been cleared via a soft
reset. Clearing the memory above 1 MB next.
4Dh
The memory above 1 MB has been cleared via a soft
reset. Saving the memory size next. Going to checkpoint
52h next.