Troubleshooting and Repair 3-7
Table 3-3 BIOS Beep Codes
Beep
Code
Diagnostic
Code
Description
Test Performed
2-1-1
2-1-2
2-1-3
2-1-4
2-2-1
2-2-2
2-2-3
2-2-4
2-3-1
2-3-2
2-3-3
2-3-4
2-4-1
2-4-2
2-4-3
2-4-4
10h-1Fh
First 64K RAM chip or
data line failure on bit x
The first 64K of RAM is tested with a
rolling ones test and a pattern test. If
any of the rolling ones tests fail, then
the BIOS reports the specific bit that
failed. To determine the bit number
from the diagnostic code, subtract 10h.
For example, if 12h is displayed at the
diagnostic port, bit 2 failed. Failure
results in a system halt.
3-3-1
20h
Slave DMA register test in
progress or failure.
Pattern test of channels 1 through 3 of
the slave controller (starting port
address = 02h). Failure results in a
system halt.
