Coin counter

The coin counter is an internal electromechanical device used to count inserted coins in MVS cabs. It could be a law-imposed device.

The counter has typically one pin hardwired to +12V, and the other one connected to the MVS board. It is operated by the MVS board, not directly by the coin chutes.

When writing to or, current flows through the counter, it's incremented. When or   are written to, current flow is stopped.