Oscilloscope as the graphical display

Tennis for Two was a game developed in 1958 on an analog computer, which simulates a game of tennis on an oscilloscope. Created by American physicist William Higinbotham, it is important in the history of video games as one of the first electronic games to use a graphical display. The game uses an oscilloscope as the graphical display to display the path of a simulated ball on a tennis court.