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Use this tag for questions about the specialist diagnostic software provided by manufacturers, or built into equipment. Do not use this tag for questions generally asking how to diagnose a problem or diagnostic techniques.

3 votes
1 answer
269 views

Please Identify this Apple II Diagnostic Message: "IOU FLAG E5: 1 2 3 4 8"

Does anybody know the meaning of this message from the Apple IIe diagnostic? IOU FLAG E5: 1 2 3 4 8 What are addressing the 1 2 3 4 8? I’m pretty sure that IOU is the I/O chip, E5 is the location …
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