Tank uses a black and white Motorola television for its display. The control panel consists of four military-style joysticks, two per player, with a fire button mounted on top of the right joystick of each pair.
Inserting coins immediately starts the game, placing the players in the upper right and lower left corners of the maze respectively. The first 50 or so cabinets produced have a protruding wooden coin box area between the two speaker grills.
Tank was the first game to use IC-based ROM to store graphical data. Although Gran Trak 10, released in July 1974, was the first arcade game to use solid state ROM data, Gran-Trak's ROM used an earlier diode-based ROM technology. The custom game cabinet was designed by Peter L. Takaichi and patented October 20, 1975 (US Patent # D243,624).
Players move their tanks through a maze on screen, avoiding mines and shooting each other. The players are represented by one black and one white tank sprite, and mines are denoted by an "X". Points are scored by shooting the opponent or when a player runs over a mine; the player with the highest score at the end of the time limit wins the game.
The tanks are controlled by two joysticks in a dual configuration. Pushing both joysticks will move the player's tank forward, and pulling them both back causes the tank to stop. Moving the right joystick forward while pulling the left joystick back will cause the tank to turn right, while reversing the motion will cause the tank to turn left.
Source: Wikipedia, "Tank (video game)", available under the CC-BY-SA License.