Input (grade 13): The 1983 revision of the Atari 5200 has two controller ports instead of four, and a change back to the more conventional separate power supply and standard non-autoswitching RF switch.
Output (grade 6): The 1983 version of the Atari 5200 has two controller ports instead of four. Atari changed back to the a simpler separate power supply and manual RF switch.