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Table 14-3
Four-Digit Failure Code Interpretation
Digits From
Equivalent
Example
Binary Value
D →
→
→
F →
→
→
→
4 →
0
*
Refer to the 10-digit failure code description for more information.
†
LED DS12 remains on after pressing PRESET.
Chapter 14
A16
LEDs
8
16
Video RAM *
4
15
I/O Bus Address *
2
14
CPU
1
13
68230
8
I/O Bus (Odd byte)
†
12
4
11
I/O Bus (Even byte)
2
10
User RAM
1
9
User RAM
8
8
User RAM
4
7
User RAM
6
NOT USED
5
NOT USED
8
4
ROM (Odd B LSB)
4
3
ROM (Even B LSB)
2
2
ROM (Odd A LSB)
1
1
ROM (Even A LSB)
Interpreting Analyzer Messages
A16 Circuit Tested
Analyzer Messages
A16 Reference
Designator
U305, U306
U18
U12
U57
U2
U3
U5
U22
U5
U22
U6
U23
U7
U24
633
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Troubleshooting
