The basic concept of an Arcade machine is that you insert your coin into the machine that would then activate the micro-processor and the game would begin. All arcade machines are basically the same, just a Tv screen and motherboard inside a wooden cabinet with perhaps 1 to 4 controllers sticking out of it. I personally quite like the idea due to how simple it actually it is.

During the next months Nolan Bushnell saw a demonstration of the Magnavox Odyssey and decided that he, Ted Dabney and Al Alcorn would make a version of the magnavox odyssey's tennis and name it Pong. The simple design was made from a TV from walgreens, the motherboard and the coin slot from a laundromats simplely with a milk carton. The prototype was tested in tavern and a few days after they were called to fix it, once they had opened it they realised that the only problem was the coin slot had over filled and caused it to short curcuit. They knew they had a hit
This was considered the start of the Arcade Machine Industry.