The Japanese video game industry developed a standard for connecting a video game motherboard to a cabinet. The JAMMA standard was a large board-edge connector

The Japanese video game industry developed a standard for connecting a video game motherboard to a cabinet. The JAMMA standard was a large board-edge connector that delivered power and coin/joystick/button inputs, and sent out composite video signals to a monitor. Once the standard took hold, it was economically feasible to sell generic cabinets. Arcade operators could update, rotate, and install new titles without having to move heavy bulky plywood cabinets in and out of arcades. These cabinets got the nickname "candy cabinets" for unknown reasons although it might be connected to an old SNK/NeoGeo line of cabinets. https://www.hard--candy.com/wiki/ https://www.hard--candy.com/wiki/ The OP article explains that Japanese law said that these generic cabinets had to do something out of the box, probably to allow the purchaser to test the product. Sega and Taito created very cheap JAMMA motherboards that came preinstalled with a small game to do this. It was expected that this board would be tossed out immediately and a real game attached to the harness after that.