800XL Joystick response

[+hueyjones70]

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?

[jamm]

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:

 

[+hueyjones70]

I found the problem, one of the inductors on the right side of the MB was bad.  I believe it was L23.