I'm sorting out a couple of gunfight daugterboards for another member who's getting a midway gunfight cab.
The only issue I have now is the reset.
The plan is it fit a switching PSU to replace the old standard midway PSU but since the old PSU also provides the reset signal to get the game running I need to generate one myself.
Tried this circuit but reversed so it starts high and then drops to GND but the signal doesn't drop all the way to GND and is thus causing issues.
I was going to try and use aTC1232 chip but that requires a constant signal going low to let it know the CPU is still running and I can't get that without adding wires from the main PCB to the reset circuit.
Any ideas?
The only issue I have now is the reset.
The plan is it fit a switching PSU to replace the old standard midway PSU but since the old PSU also provides the reset signal to get the game running I need to generate one myself.
Tried this circuit but reversed so it starts high and then drops to GND but the signal doesn't drop all the way to GND and is thus causing issues.
I was going to try and use aTC1232 chip but that requires a constant signal going low to let it know the CPU is still running and I can't get that without adding wires from the main PCB to the reset circuit.
Any ideas?