The later Atari 800 port required a more complicated handling of string variables. The three ports were finished before Avalon Hill saw the game at a gaming convention and licensed it in 1982 as one of its first computer games.
The subsequent Atari 800 version required a more sophisticated handling of string data, which was completed prior to Avalon Hill's discovery of the game at a gaming event in 1982, leading to its licensing as one of their first computer games.