Atari 2600 System "4-Switch" (Atari 2600)

This is the 4-Switch model of the Atari 2600.

The Atari 2600 (or Atari VCS before 1982) is a home video game console by Atari, Inc. Released on September 11, 1977, it is credited with popularizing the use of microprocessor-based hardware and ROM cartridges containing game code, a format first used with the Fairchild Channel F video game console in 1976. This format contrasts with the older model of having non-microprocessor dedicated hardware, which could only play the games that were physically built into the unit.