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A2S4000 Garbage Character and Can’t Run ADTPro

Today we troubleshoot a newly purchase A2S4000 and quickly diagnose a bad RAM chip issue. And we learn why you should just always start your day with a self-RAM test. Welcome to the latest fixer upper post. Today we have an Apple IIC A2S4000 with no accessories and no external power supply. It was purchased…

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Apple IIC AP68 Floppy Drive Stepper Motor

An Apple IIC floppy disk drive wasn’t working the other day. After lots of headscratching we find that the stepper motor is not functioning. After much circuit tracing, we checked continuity into the inductors of the stepper motor and found one of the four phases was failed, indicating a failed connection inside the stepper motor…

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