1 reply to this topic

[82atari5200]

I recently replaced the keyboard multiplexer on my 800xl motherboard. After doing that, none of the built in programs work. If I put a cartridge in it boots up fine but the joystick won't move. only the fire button works.most of the keys on my keyboard now work but some still don't I've replaced every major I.C. on it. any suggestions would be appreciated.

[DamageX]

It sounds like PIA is the problem. Did you put it in backwards?