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Thanks, this was very helpful! I recently got my Dad's old 128K upgraded to a Plus, and was having the issue where the mouse wouldn't move left or right intermittently. This is the original 1984 M0100, with 2 screws, and no ICs on the circuit board. I remember when I was a kid that the clip...

Thanks, this was very helpful! I'm having the issue of no left/right movement with my 1984 M0100 mouse, and I figured out a way to test it without needing an oscilloscope. I connected ground and power to the DB9 connector pins 1 and 2, then connected 2 LEDs between ground and pins 4 and 5. I...

I have my Dad's Mac 128K that was later upgraded to a Plus. I got it working again, but recently the ground cable from the CRT yoke got too close to the red cable from the flyback, and it shorted. I'm assuming the insulation on the red flyback is not working as well as it did originally and...

That did it! Thanks so much!

Hi, I'm new here. My Dad recently gave me his Mac Plus that he bought new as a 128k in '84, then later had upgraded to a Mac Plus. It boots fine from floppy, but I can't get it to work with my BlueSCSI 2, which I ordered from Joe's Computer Museum fully assembled. When I boot from floppy, I...