- The first version of "Spacewar!" was developed for the PDP-1 at MIT in 1960. The first CRT display was a converted oscilloscope used to play SpaceWar.The first trackball (and thus, the first mouse) was a SpaceWar control at MIT. It also is said that Ken Thompson salvaged a PDP-1 and created a new operating system, now called UNIX, so that he could play SpaceWar. The gameplay was inspired by E. E. "Doc" Smith's Lensman novels. It is a two player game, each controlling a ship, trying to blast each other with torpedos. There is a sun in the center of the playing field who's gravity draws you and your torpedos into it. You must try to aim torpedos, such that their trajectory is deflected by the sun's gravitational force until it hits the other player's ship, but watch out YOU don't get sucked in!