Quoted from acebathound:Any interest in a plug-and-play mod for Classic Bally/Stern pinball machines that would plug into the cabinet switch header on the MPU & then turn the credit button on the front of the cab into a "free play" button? I have a circuit I was playing around with today on the bench that seems to be working.
I would take a stack of those with me to Banning this weekend and install in every game I could see.