Atari never intended to create a chess game for the Atari 2600, when the system was first introduced. But the original videoconferencing box was a chess piece on it, and Atari eventually sued someone in Florida because of the lack of a real game of chess on the system. Some time later, Atari's engineers began working on a version of Chess 2600.
Although the video delivery over chess games in 4K, the previous versions of the game were larger. This prompted Atari to invent a bank-switching drives that will be used in later titles that require more than 4K address space.