User Guide

Troubleshooting and Repair
FIC A440 Series Service Manual 6-7
Table 6-3 (c) BIOS Beep Codes
Beep
Code
Diagnostic
Code
Description Test Performed
None 28h CMOS RAM power failure
and checksum calculation
test in progress.
The power-fail bit in CMOS RAM is
tested and the lower CMOS RAM area is
being checksummed. A failure does not
result in system halt.
None 29h CMOS RAM configuration
validation for video in
progress.
No specific test is performed - just
indicates that the configuration specified
in CMOS for video is being matched
against the actual installation. A failure
does not result in a system halt.
3-3-4 2Bh Screen memory test in
progress or failure.
The video buffers (B0000h and B8000h)
are tested with a pattern test and a
rolling ones test. Failure will result in a
beep code but not a system halt.
3-4-1 2Ch Screen initialization in
progress.
Until the video installation is confirmed,
any calls to INT 10h Function 0 (set
mode) will be prefaced with the
diagnostic code. There is no expected
failure from this.
3-4-2 2Dh Screen retrace test in
progress or failure.
Over a period of time, the retrace bit
(bit0) in the appropriate CRT controller
status register (either port 3BAh or
3DAh) is read and tested. The retrace bit
should toggle from 0 to 1, then 1 to 0
within the time period.
None 2Eh Search for video ROM in
progress.
No specific test is performed by the
system BIOS - just indicates that the
BIOS is about to jump to the initialization
code in the video option ROM.
none 30h Screen running with video
ROM.
No specific test is performed - just
indicates that a video option ROM was
found and believed to be operating.
none 31h Monochrome monitor
operable.
No specific test is performed - just
indicates that the BIOS believes a
monochrome monitor is installed and is
operating.
none 32h Color monitor (40-column)
operable.
No specific test is performed - just
indicates that the BIOS believes a color
monitor is installed and is operating. The
mode has been set to 40-column as
selected by the user in CMOS RAM.
none 33h Color monitor (80-column)
operable.
No specific test is performed - just
indicates that the BIOS believes a color
monitor is installed and is operating. The
mode has been set to 80-column as
selected by the user in CMOS RAM.