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25h Interrupt vector initialization is done. Clearing the
password if the POST DIAG switch is on.
27h Any initialization before setting video mode will
be done next.
28h Initialization before setting the video mode is
complete. Configuring the monochrome mode and
color mode settings next.
2Ah Bus initialization system, static, output devices will
be done next, if present. See page 131 for
additional information.
2Bh Passing control to the video ROM to perform any
required configuration before the video ROM test.
2Ch All necessary processing before passing control to
the video ROM is done. Looking for the video ROM
next and passing control to it.
2Dh The video ROM has returned control to BIOS POST.
Performing any required processing after the video
ROM had control.
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 test 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.
Checkpoint Code Description
aa300.book Page 125 Tuesday, December 17, 2002 5:27 PM