123

	123

Checkpoint Code	Description

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 129 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.