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  1. clpo13

    Mac Plus M0100 mouse only moves horizontally

    You can do a lot with keyboard shortcuts! But no, I shelved it until I came across a known-good mouse recently, and it got me thinking about the problem again.
  2. clpo13

    Mac Plus M0100 mouse only moves horizontally

    Well, almost four years later and I finally figured out what was going on. I don't know how much this will help anyone else running into a similar problem, but for me it was simply a broken trace on the logic board between pin 9 of the mouse port and the nearest RC filter. Once I repaired the...
  3. clpo13

    Mac Plus M0100 mouse only moves horizontally

    I picked up a Macintosh Plus the other day. It boots just fine, but the mouse that came with it (model M0100) doesn’t move vertically. Horizontal movement and the button work, though. I cleaned the mouse thoroughly inside and out and confirmed continuity of the mouse wire and circuit paths on...
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