Coin counter

A 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 software (?), not directly by the coin chutes.

Control

Only the system ROM should be doing this.

When writing to REG_SETCC1 or REG_SETCC2, current flows through the counters, they're incremented. When REG_RESETCC1 or REG_RESETCC2 are written to, current flow is stopped.