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Old 28 March 2020, 17:00   #9
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Join Date: Dec 2018
Location: UK
Posts: 965
If you open up the external floppy drive enclosures you will find that there is a controller board connected to a floppy drive.

You can swap the floppy drive in these enclosures and test whether the issue is with the controller board, or the floppy drive.

Normally now I use ATK as it does all of what DriveTest does, and more, but with a nicer and more intuitive interface interface. ATK also show the index pulses which is also imporant.

Regarding the CIA - they handle some of the floppy drive signals and perform important timing functions required by the system. However, since the internal drive and one for the external drives seem to be working fine then the issue is probably not with them.
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