Apple II
Developed by Atarisoft in 1983.
Atari 5200 & 400/800/XL/XE
Developed by Atari in 1983. As was typical for these two systems, the 5200 version was visually identical to the Atari home computer versions. Both versions could be played with two joysticks. The 5200 version came with a special accessory that allowed two controllers to be held together.
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screen
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5200 box
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400/800 box
Atari 7800
Developed by Atari and published in 1986. Can also be played with two controllers.
Atari Lynx
Developed by Atari in 1991. Due to the lack of controls, you use 1 button to change the shooting direction clockwise, and the other counter-clockwise. You automatically shoot.
Atari ST
Developed by Andromeda Software and published by Atari in 1987.
Commodore 64
Developed by Atarisoft in 1983.
Commodore VIC-20
Developed by Atarisoft in 1983.
IBM PC
Developed by Atarisoft in 1983.
Xbox 360
Developed by Digital Eclipse Software, Robotron launched on the Xbox Live Arcade in early 2006. Although it is presented with an impressive upgrade in graphics, the gameplay itself is extremely accurate to the arcade, so you get the best of both worlds.