It's very easy to do with an arduino. I have documented PS/2 to NeXT conversion here:
http://www.asterontech.com/Asterontech/next_ps2_mouse.html
Everything will be the same for the mac or Atari except the pinout at the computer side.
http://www.asterontech.com/Asterontech/next_ps2_mouse.html
Everything will be the same for the mac or Atari except the pinout at the computer side.
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