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System Board, Connectors, and Error Messages D-11
BEEP CODES
Beep codes can signify a terminal error. If the BIOS detects
a terminal error condition, it sounds an error beep code,
halts the POST, and attempts to display a port 80h code on
the POST card’s LED display. A table of beep codes
follows.
Beep Codes
BEEPS
80H CODE
DESCRIPTION
1
B4h
One short beep before boot
1-2
98h
Search for options ROMs
1-2-2-3
16h
BIOS ROM checksum
1-3-1-1
20h
Test DRAM refresh
1-3-1-3
22h
Test 8742 keyboard controller
1-3-4-1
3Ch
RAM failure on address line
xxxx
1-3-4-3
2Eh
RAM failure on data bits
xxxx of
low byte of memory bus
1-4-1-1
30h
RAM failure on data bits
xxxx of
high byte of memory bus
2-1-2-3
46h
Check ROM copyright notice
2-2-3-1
58h
Test for unexpected interrupts