Appendix A. Error Codes
Beep Codes
For the following beep codes, the numbers indicate the sequence and number of beeps. For example, a
“2-3-2” error symptom (a burst of two beeps, three beeps, then a burst of two beeps) indicates a memory
module problem. An
x in an error message can represent any number.
Figure 34. Beep Codes – PC 100
Beep Code
Probable Cause
1-2-2-3
BIOS ROM checksum
1-3-1-1
Test DRAM refresh
1-3-1-3
Keyboard controller
1-3-4-1
Memory Failure
1-3-4-3
Memory Failure
1-4-1-1
Memory Failure
2-1-2-3
ROM error
2-2-3-1
System board failure
1-2
Option card ROM failure
Figure 35. Beep Codes – PC 300
Beep Code
Probable Cause
1-1-3
CMOS write/read failure
1-1-4
BIOS ROM checksum failure
1-2-1
Programmable interval timer test failure
1-2-2
DMA initialization failure
1-2-3
DMA page register write/read test failure
1-2-4
RAM refresh verification failure
1-3-1
1st 64 K RAM test failure
1-3-2
1st 64 K RAM parity test failure
2-1-1
Slave DMA register test in progress or failure
2-1-2
Master DMA register test in progress or failure
2-1-3
Master interrupt mask register test failure
2-1-4
Slave interrupt mask register test failure
2-2-2
Keyboard controller test failure
2-3-2
Screen memory test in progress or failure
2-3-3
Screen retrace tests in progress or failure
3-1-1
Timer tick interrupt test failure
3-1-2
Interval timer channel 2 test failure
3-1-4
Time-of-Day clock test failure
3-2-4
Comparing CMOS memory size against actual
3-3-1
Memory size mismatch occurred
42
Technical Information Manual
Summary of Contents for PC 100
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