61
A Error Messages
BIOS Beep Codes
One long beep followed by several short beeps indicates a video problem.
Table 40.
Beep Codes
Beeps
Port 80h Code
Explanation
1-2-2-3
16h
BIOS ROM checksum
1-3-1-1
20h
Test DRAM refresh
1-3-1-3
22h
Test Keyboard Controller
1-3-3-1
28h
Autosize DRAM
1-3-3-2
29h
Initialize POST Memory Manager
1-3-3-3
2Ah
Clear 512 KB base RAM
1-3-4-1
2Ch
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
2-1-2-2
45h
POST device initialization
2-1-2-3
46h
Check ROM copyright notice
2-2-3-1
58h
Test for unexpected interrupts
2-2-4-1
5Ch
Test RAM between 512 and 640 KB
1-2
98h
Search for option ROMs. One long, two short beeps on checksum failure