JAMMA

JAMMA is an acronym, standing for Japanese Amusement Machine Manufacturers' Association. This term represents three different things: a trade association, a trade show in Japan and a wiring standard for arcade machines.

The JAMMA wiring standard was introduced in the mid-1980s. Arcade cabinets wired to the JAMMA standard can be made to play all games built to this standard, simply by installing the circuit boards for the new game. By the 1990s, most new arcade games were JAMMA standard. As the majority of arcade games were designed in Japan at this time, JAMMA became the de facto world standard. Many games exist which almost conform to the standard but extend it in some way, for example by adding support for extra buttons. These games are sometimes referred to as JAMMA+.

The JAMMA standard includes signals for two eight-direction joysticks, two player start buttons and six control buttons (three per player), with monaural sound.