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Apple II[edit]

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Developed by Atarisoft in 1983.

Atari 2600[edit]

Developed by Atari in 1984. Considered surprisingly accurate. Later re-released as Defender II.

Atari 5200 & 400/800/XL/XE[edit]

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Developed by Atari in 1984. As was typical for these two systems, the 5200 version was visually identical to the Atari home computer versions. This version was ultimately never released. A prototype version of the ROM was leaked to the public.

Commodore 64[edit]

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Developed by Atarisoft in 1985. This version appears to be an unaltered version of an unofficial conversion of Defender known as Guardian.

IBM PC[edit]

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Developed by Atarisoft in 1983.

NES[edit]

Developed by HAL. Released in Japan as Stargate in September, 1987. Released in the U.S. as Defender II in July, 1988.