NEC VERSA 6000 Series Service Manual page 77

Beep Diagnostic Description
Code
Code
3-4-2 2Dh Screen retrace test in
progress or failure.
None 2Eh Search for video ROM in
progress.
none 30h Screen running with video
ROM.
none 31h Monochrome monitor
operable.
none 32h Color monitor (40-column)
operable.
none 33h Color monitor (80-column)
operable.
4-2-1 34h Timer-tick interrupt test in
progress or failure.
4-2-2 35h Shutdown test in progress
or failure.
Table 3-3 BIOS Beep Codes
Test Performed
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.
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.
No specific test is performed - just
indicates that a video option ROM was
found and believed to be operating.
No specific test is performed - just
indicates that the BIOS believes a
monochrome monitor is installed and is
operating.
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.
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.
All interrupts expect the timer-tick
interrupt are masked off at the interrupt
controllers. If a timer-tick interrupt does
not occur during a specific time period,
an error message is displayed on the
screen. The system does not halt.
A return address is stored in 40:67h
and the processor is reset via the
keyboard controller. If a timer tick
occurs during this time period, an error
message is displayed on the screen.
Other failures are hard to detect. If
possible, the BIOS will continue with
POST, skipping the memory tests.
Troubleshooting and Repair 3-9