Appendix D: Industrial Devices
Checkpoint |
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Code |
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37h | The display mode | is set. Displaying | the power | on | |||
message next. |
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38h | Initializing the bus input, IPL, general devices next, if | ||||||
present. See Table |
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39h | Displaying bus initialization error messages. See Table | ||||||
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3Ah | The new | cursor position | has been read and saved. | ||||
Displaying the Hit <DEL> message next. |
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3Bh | The Hit <DEL> message is displayed. The protected | ||||||
mode memory test is about to start. |
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40h | Preparing the descriptor tables next. |
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42h | The descriptor tables are prepared. Entering protected | ||||||
mode for the memory test next. |
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43h | Entered | protected | mode. | Enabling | interrupts | for | |
diagnostics mode next. |
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| Interrupts enabled if the diagnostics switch is on. | ||||||
44h | Initializing data to check memory wraparound at 0:0 | ||||||
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45h | Data initialized. Checking | for memory wraparound | at | ||||
0:0 and finding the total system memory size next. |
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| The memory wraparound test is done. Memory size | ||||||
46h | calculation has been done. Writing patterns to test | ||||||
| memory next. |
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| The memory pattern has been written to extended | ||||||
47h | memory. Writing patterns to the base 640 KB memory | ||||||
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48h | Patterns | written in | base | memory. Determining | the | ||
amount of memory below 1 MB next. |
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| The amount of memory below 1 MB has been found and | ||||||
49h | verified. Determining the amount of memory above 1 | ||||||
| MB memory next. |
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| The amount of memory above 1 MB has been found and | ||||||
4Bh | verified. Checking | for a soft reset and clearing | the | ||||
memory below 1 MB for the soft reset next. If this is a | |||||||
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| power on situation, going to checkpoint 4Eh next. |
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4Ch | The memory below 1 MB has been cleared via a soft | ||||||
reset. Clearing the memory above 1 MB next. |
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| The memory above 1 MB has been cleared via a soft | ||||||
4Dh | reset. Saving the memory size next. Going to checkpoint | ||||||
| 52h next. |
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