One of the wild things about learning to repair old #pinball machines is trying to reverse-engineer dead concepts. There are things that were duh-obvious to the creators that I have to painstakingly deduce over days of effort.
@williampietri
As an avid player of older old pinball, I can maybe assist with that. The latter day old machines, not so much.
@williampietri
Well, the credit relay has relationship to other things besides the coin relay, for starters.
On a machine where you can earn bonus credits, the condition for the bonus has to be triggered as well.