I recently came into ownership of a (sort of) arcade machine and I'm looking for a little help to figure out if it's possible to modify it.
Long story short, the coin-op uses a simple circuit composed of a 555-timer/coil relay to cut power off to the game console, and a johnson counter/dip-switches to control the number of tokens required to play (except for switch 9, which I have no idea what it does).
The problem I've found is, inserting additional tokens during play does not reset the timer to extend play. What I'm trying to figure out is if there's an easy way to modify the circuit to have the coin-op switch (inserting a token) reset the 555 timer without the output/relay shutting off (killing power to the console).
I've spent some time tracing out the circuit as best I could. Please forgive the spaghetti of wiring, I laid out components in the schematic how they were arranged on the PCB to make following the wires easier. I'm sure it's not perfect, there were a lot of annoying vias hidden underneath the ICs, so take it with a grain of salt and absolutely question anything that doesn't make sense so I can check/correct it.
Would anyone have an idea on how to have the coin-op switch cause the 555 timer to reset without the relay shutting off?
For anyone interested, the long of it is the machine is actually a store demo kiosk, basically just an arcade machine-shaped metal cabinet that had the plain home console inside it. Usually they were used for advertising purposes to let people try the console before buying it (or to demo new games) in toy stores, movie rental stores, and the like. They were built to order, and this specific one is a bit of an oddity in that it sports the uncommon pedestal arcade coin-op mechanism (presumably it was ordered for use in an arcade, but it's been through a few owners hands by now so the origins are unknown).