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6 Tests and Error Messages
Order in Which POST Tests Are Performed
30h Display memory read/write test passed. Looking for retrace checking.
31h Display memory read/write test or retrace failed. Performing the alternate display retrace
checking.
32h Alternate display memory read/write test passed. Looking for alternate display retrace
checking.
34h Video display checking is complete. Setting the display mode.
37h Display mode is set. Displaying the display mode text.
38h Initializing the bus input, IPL, and if present and general devices.
39h Displaying the bus initialization errors.
3Ah New cursor position has been read and saved. Displaying the Hit <DEL> message.
40h Preparing the descriptor tables.
42h Descriptor tables are prepared. Entering protected mode for the memory test.
44h Interrupts enabled if the diagnostics switch is on. Initializing data to check memory wrap-
around at 0:0.
45h Data initialized. Checking for memory wrap-around at 0:0 and finding total system memory
size.
47h Memory pattern has been written to extended memory. Writing patterns to the base
640 KB memory
48h Patterns written in base memory. Determining the amount of memory below 1 MB.
49h Amount of memory below 1 MB has been found and verified. Determining the amount of
memory above 1 MB.
4Bh 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. If this is a power on situation, going to
checkpoint 4Eh.
4Ch Memory below 1 MB has been cleared via a soft reset. Clearing the memory above 1 MB.
4Dh Memory above 1 MB has been cleared via a soft reset. Saving the memory size. Going to
checkpoint 52h.
4Eh Memory test started, but not as the result of the soft reset. Displaying the first 64 KB
memory size.
Checkpoint
Code
POST Routine Description (Continued)
(A Check Point Code is NOT an error code or error number)