User’s Manual
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| Code | Description |
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| 4B | The amount of memory above 1MB has been found and verified. |
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| Checking for a soft reset and clearing the memory below 1MB for the |
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| soft reset next. |
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| If this is a power on situation, going to checkpoint 4Eh next. |
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| 4C | The memory below 1MB has been cleared via a soft reset. Clearing |
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| the memory above 1MB next. |
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| 4D | The memory above 1MB has been cleared via soft reset. Saving the |
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| memory size next. Going to checkpoint 52h next. |
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| 4E | The memory test started, but not as the result of a soft reset. |
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| Displaying the first 64KB memory size next. |
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| 4F | Memory size display started. This will be updated during memory test. |
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| Performing the sequential and random memory test next. |
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| 50 | Memory testing/initialization below 1MB completed. Going to adjust |
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| displayed memory size for relocation and shadowing. |
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| 51 | The memory size display was adjusted for relocation and shadowing. |
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| Testing the memory above 1MB next. |
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| 52 | The memory above 1MB has been tested and initialized. Saving the |
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| memory size information next. |
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| 53 | The memory size information and the CPU registers are saved. |
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| Entering real mode next. |
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| 54 | Shutdown was successful. The CPU is in real mode. Disabling the |
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| Gate A20 line, parity, and the NMI next. |
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| 57 | The A20 address line, parity, and the NMI are disabled. Adjusting the |
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| memory sizedepending on relocation and shadowing next. |
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| 58 | The memory size was adjusted for relocation and shadowing. Clearing |
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| the Hit <DEL> message next. |
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| 59 | The Hit <DEL> message is cleared. The <WAIT…> message is |
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| displayed. Staring the DMA and interrupt controller test next. |
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| 60 | The DMA page register test passed. To do DMA#1 base register test. |
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| 62 | DMA#1 base register test passed. To do DMA#2 base register test. |
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| 65 | DMA#2 base register test passed. To program DMA unit 1 and 2. |
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| 66 | DMA unit 1 and 2 programming over. To initialize 8259 interrupt |
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| controller. |
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| 7F | Extended NMI sources enabling is in progress. |
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| 80 | The keyboard test has started. Clearing the output buffer and checking |
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| for stuck keys. Issuing the keyboard reset command next. |
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