hueyjones70 Posted March 2, 2020 Share Posted March 2, 2020 I have an 800XL that doesn't respond to the joystick down in Port 1. Joystick works ok in port 2. Have resoldered the joystick input connections and no change. I have no idea where to start trouble shooting. Is there a particular chip/pin that carries that joystick signal? Quote Link to comment Share on other sites More sharing options...
jamm Posted March 2, 2020 Share Posted March 2, 2020 The joysticks are read by the PIA chip - should be the chip on the lower-right of your motherboard marked 6520 or 6520B. It's a standard chip, so you could swap it out (or at least check the pins). See this thread: 2 Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted March 3, 2020 Author Share Posted March 3, 2020 I found the problem, one of the inductors on the right side of the MB was bad. I believe it was L23. Quote Link to comment Share on other sites More sharing options...
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