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850 Parallel Loop Back Tester


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I have the pinouts for the 850 interface parallel port, but I was wondering if anyone has a correct wiring diagram and a program to test the port.

A standard 25 pin loop back testor won't work on Atari's 15 pin port. I really don't want to start looking for an old Atari or Epson dot matrix printer

to test the port.




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