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Chapter 5: Troubleshooting
POST Code Listing (AMI Motherboard only)
5–26
2Eh Completed post-video ROM test processing. If the EGA/VGA controller is not found, performing
the display memory read/write test next.
2Fh The EGA/VGA controller was not found. The display memory read/write test is about to begin.
30h The display memory read/write test passed. Look for retrace checking next.
31h The display memory read/write test or retrace checking failed. Performing the alternate display
memory read/write next.
32h The alternate display memory read/write test passed. Looking for alternate display retrace
checking next.
34h Video display checking is over. Setting the display mode next.
37h The display mode is set. Displaying the power on message next.
38h Initializing the bus input, IPL, general devices next, if present.
39h Displaying bus initialization error messages.
3Ah The new cursor position has been read and saved. Displaying the Hit message next.
3Bh The Hit 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 test.
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 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.
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.
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 has been 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 has been tested and initialized. Saving the memory size information next.
53h The memory size information and the CPU registers are saved. Entering real mode next.
54h Shutdown was successful. The CPU is in real mode. Disabling the Gate A20 line, parity, and NMI.