The final "Computer Space" design uses no microprocessor; the entire computer system is a state machine made of 7400-series integrated circuits, with monochrome graphic elements held in diode arrays. The arrays, which Bushnell designed to let him rotate the rocket in 16 directions with only 4 arrays, are laid out in the shape of the ships, to make it obvious to game operators what would need to be replaced if something broke. The ships themselves are drawn on the screen as a pattern of dots, rather than connected lines, and the cabinet includes a General Electric 15-inch black and white television screen as the monitor, specially modified for the game. In the rudimentary algorithm constructed by Bushnell, the enemy ships fire towards the quadrant of the screen that the player's rocket is in, rather than directly at the player's rocket.