Description
Error
Indication
Video adapter presence test:
Checks for attached video
adapters by nondestructive writing
and
reading hex A55A to address
hex
BOOOO
and
B8000. Checks for
video adapters with valid rom.
Checks for
LCD
by determining
if
the
'LCD
sense' line is set.
Video interrupt vectors
initialization:
Initializes hex
10,
I D, I F
and
44 video interrupt
vectors to system default values.
Video
ROM
validity tests: Checks
for video adapter with valid
ROM.
See Volume I for additional
information
about
adapters with
system accessible
ROM. Links to
ROM
if
valid.
LCD
function test: Runs
LCD
Error 5001, 5002,
or
function
test
if
the LCD is present.
5003
CRT
adapter without
ROM
Error 0501
presence andfunction tests:
Ifa
CRT
adapter without
ROM
is
present, test vertical
and
horizontal syncs.
Operable display presence test: I-long
and
2-short
Checks to ensure
that
an operable beeps, then system
display is present. power off.
Figure 1-1
(Part
2
of
7). Power-on Self-Test Sequence
Power-On Self-Test
(POST)
1-3
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