Quoted from Allibaster:Final question: Is there a way to bench test this? My dad and his game are 100 miles away. I have his CPU board. I do have a Fish Tales available. Can I install this board in there to verify, or would that cause issues?
Yes, you can bench test this; all you need is a power supply that produces +5V and +12V and a logic probe. You can also just connect your logic probe to U20-16 with the processor in the machine and see if providing low going pulses.