Checkpoint
25h
27h
28h
2Ah
2Eh
2Fh
30h
31h
32h
34h
37h
38h
39h
3Ah
3Bh
40h
42h
43h
44h
45h
46h
47h
48h
49h
4Bh
Code Description
Interrupt vector initialization is done. Clearing the password if the POST DIAG switch is on.
Any initialization before setting video mode will be done next.
Initialization before setting the video mode is complete. Configuring the mono- chrome mode and color mode settings next.
Bus initialization system, static, output devices will be done next, if present. See the last page for additional information.
Completed
The EGA/VGA controller was not found. The display memory read/write test is about to begin.
The display memory read/write test passed. Look for retrace checking next.
The display memory read/write test or retrace checking failed. Performing the alter- nate display memory read/write test next.
The alternate display memory read/write test passed. Looking for alternate display retrace checking next.
Video display checking is over. Setting the display mode next.
The display mode is set. Displaying the power on message next.
Initializing the bus input, IPL, general devices next, if present. See the last page of this chapter for additional information.
Displaying bus initialization error messages. See the last page of this chapter for additional information.
The new cursor position has been read and saved. Displaying the Hit <DEL> mes- sage next.
The Hit <DEL> message is displayed. The protected mode memory test is about to start.
Preparing the descriptor tables next.
The descriptor tables are prepared. Entering protected mode for the memory test next.
Entered protected mode. Enabling interrupts for diagnostics mode next.
Interrupts enabled if the diagnostics switch is on. Initializing data to check memory wraparound at 0:0 next.
Data initialized. Checking for memory wraparound at 0:0 and finding the total sys- tem memory size next.
The memory wraparound test is done. Memory size calculation has been done. Writing patterns to test memory next.
The memory pattern has been written to extended memory. Writing patterns to the base 640 KB memory next.
Patterns written in base memory. Determining the amount of memory below 1 MB next.
The amount of memory below 1 MB has been found and verified.
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.
