Sadly didn't help. Thought I would just try desoldering both CIAs (hoping I don't make them worse) so I can try swapping them. Eventually i'll order a J-CIA. Thanks for your help though. This is my first time trying to repair anything and your videos have been a huge help and boost of confidence 😄
Update on this. Finally managed to socket both CIAs (without breaking anything :D), swapped the CIAs around and the 2nd joystick now works. So indeed the CIA can have a weird failure mode where the KB seemingly works but a joystick button doesn't. Nice learning experience still :)
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