I finally got the mpu on the sio pcb changed out and my NFL/NBA lives again. I still have 1 problem though. The 4 output wires from the i40 board are hanging there unattached so I have no joystick input. For the life of me I cannot remember where they attach to. Everything else is hooked up and works and if I short them across the inputs into the sio pcb they all register fine in test mode. I even have pix of every harness and location except for that 1! The wiring diagram isn't any help (doesn't show exact hook up) and I have googled everywhere for more exact info or pictures and found nothing useful.
If some kind person could point me in the right direction or send me a few photos of theirs, I would be most appreciative.
Pessimist: Oh, this can't get any worse!
Optimist: Yes, it can!