@Wearwolf Microcontrollers are generally low-power devices that do a single thing, and can for years with no maintenance. They usually don't have "extra" stuff like graphics, networking.

If you use a computer in a way where it acts like a microcontroller, it's still a computer, just acting as a microcontroller.

Modern arcade cabinets probably won't be microcontrollers since they usually are SoCs, older machines might fit the description since the circuits are designed for a single game.