In 1984, Atari planned to release Mario Bros. for their Atari 8-bit computer line (400/800/XL/XE). This port was identical to the previously released Atari 5200 version of the game. For unknown reasons, the game was canceled despite being fully finished. Mario Bros. would eventually receive an Atari 8-bit release in 1988, but this port was completely different than the 1984 prototype.

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