The Atari 5200, released in 1982, was amazing for its time. The system had four controller ports, and also featured a new controller with a joystick, number buttons, two buttons on each side of the controller and buttons for Start, Pause, and Reset. The Atari 5200 was originally called the Atari Video System X and was codenamed Pam after a woman working at Atari. The Atari 5200 did poorly because of its inability to games for the Atari 2600, although an adapter was later released in 1983 allowing it to play all Atari 2600 games.
Another problem was that Atari mostly focused on the Atari 2600. The 5200 had a lot of design mistakes, and the system is generally considered to have been poor.
Next Up, the Atari 7800!
