The 5200's internal hardware is almost identical to that of Atari's 8-bit computers, although software is not directly compatible between the two systems. The 5200's controllers have an analog joystick and a numeric keypad along with start, pause, and reset buttons. The 360-degree non-centering joystick was touted as offering more control than the eight-way joystick controller offered with the Atari 2600.

Source: Wikipedia]]> Atari 5200 2-port
This is the revised version of the Atari 5200, and it only has 2 joystick ports. However, it uses a standard connection to your television that you can purchase for a few dollars at any electronics store. Unfortunately, it seems that some 2-port units are not compatible with Pitfall! and Mountain King. However, the 2-port systems are all compatible with the VCS adapter.

Source: AtariAge]]>