@jmacz thank you so much for the linked thread! It turns out that I have EXACTLY the same issue: a metal probe on UH7 pin 4 and all of a sudden formatting works perfectly.
I admire your perseverance and thanks for the very thorough investigation and write-up.
I need to determine what would be...
I'm having an issue with a recapped SE/30. Post recap and ultrasonic cleaning, the logic board works flawlessly, except for the floppy drive. The drive works fine as a boot drive and can also read floppy disks without any issues; however formatting ANY disk fails (400K, 800K, 1.4M) .
When...
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