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The Atari 5200 was introduced in 1982 and was actually designed to be a competitor to the Intellivision before ColecoVision entered the market. Developed under the name of PAM (Atari, at the time, typically named projects after well-endowed female employees), Atari considered releasing it with that moniker; PAM in this case an acronym for 'Personal Arcade Machine'.
The Atari 5200 was also known as the 'Video System X' just prior to release.
The Atari 5200 originally retailed for $269.95.
The 5200 shared much of the architecture of the Atari 400/800 computers, but featured a different cartridge connector and completely different controllers. Non-centering analogue joysticks which offered a full 360 degrees of mobility, were both innovative and unreliable. Other controller features included a keypad, and a ahead-of-it's-time pause button. The Atari 5200 suffered from it's initial incompatibility with the VCS/2600 (an adapter was later released) and fierce competition from Coleco. When Warner Communications sold Atari Corp. to the Tramiels in 1984, they quickly removed it from the market.
You can use an adapter to play 2600 games on the 5200.