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Thank you for the offer! My other two floppy-equipped Macs are the IIfx and the Centris 650, neither of which have a floppy port. Your comment reminded me, though, that the IIfx has an additional internal floppy connector, and that did in a pinch. Bad news is, the IIfx also asserts _WRREQ when...

This might be turning into a little blog. Just to double verify, I popped the disk drive into another Mac, and it's working splendidly. Since the SWIM sits under the power supply, I'm waiting on a better solution for wiring up test probes, but since most of the signals float through to the...

Resurrecting this old post in case the right Google search comes this way. I ended up tracing my way through the IIfx Startup Circuit sketch, finding that my battery connections were fine, 5v was coming up quickly, and all of my diodes were doing exactly what diodes should. Realizing that was...

Tinkering a little last night, I realized I had an external floppy drive connected to a IIgs, so plugged that in. Exact same symptoms -- blows away part of the disk when not in write protect mode, does fine in write protect mode. At least it's consistent across both interfaces...

This has been bugging me all day, appreciate a few other eyes before I claw mine out. :) I have a Macintosh IIcx. Had some decent capacitor damage with no perceptible battery damage. Washed the board well, recapped with tantalums, had to create a bridge to complete the startup circuit. It's...

Hi, everyone. Finally de-lurking! I'm the process of resuscitating a Macintosh IIfx. After an exploding C1, resulting in me going ahead and replacing all of the big tantalums, the only two electrolytic SMDs, and the remaining axial capacitors, replacing the batteries, and repairing a trace...