Rebound (video game)
Development of "Rebound" began in late 1973, as one of several variations they produced in 1974 on the gameplay of the successful "Pong" (1972), Atari's first game and the fourth-ever arcade game. Around the same time, Atari launched Kee Games, a subsidiary meant to produce clone games of Atari's products and act as a competitor in order to expand into more distribution channels in the same region than the industry typically supported. Kee's first game, released in March 1974, was "Spike", a clone of "Rebound", which added a "spike" button to the game that made the paddle jump up and attempt to bounce the ball downwards instead of up. In addition to the base game, Atari sold a conversion kit to convert any Atari two-player "Pong" variant into "Rebound", and in 1977 "Rebound" was included in "Video Olympics" for the Atari 2600, a collection of "Pong" variants.
Atari CX40 joystick
The Atari CX40 joystick was the first widely used cross-platform game controller. The original CX10 appeared on the Atari 2600 in 1977, and was considered such a great advance over other controllers that it became the primary input device for most games on the platform. The CX10 was replaced after a year by the much simpler and less expensive CX40. The addition of the Atari joystick port to other platforms cemented its popularity, and millions of CX40s were produced and used on almost every game console and home computer of the era.