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How do these drives get out of alignment in the first place? Mechanical damage? Or just drifting over time?

My Mac II has a SWIM chip installed, and updated ROMs (the "FDHD" upgrade). I have a TL866II (though I've yet to actually use it for anything). Assuming I got the correct EPROM adapter for the SWIM PLCC, would that be something that could be dumped?

Like so! As you can see, there is a notch in the corner of the PLCC socket, as well as on the chip, which should be aligned for insertion.

May have caught that IIsi in the nick of time for it to be saved. Will obviously need new crystal cans, and those QFPs may need replacing looking at some of those legs, but looks doable at a glance...

Holy cow!

Thought I would jump in to confirm that Bruce's battery holder for the Mac II works perfectly. I've attached some pictures from my machine. :)