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The ColecoVision was well known for its expansion modules: Expansion Module #1 was the Atari 2600 adapter, which allowed almost every 2600 game to be played on the ColecoVision (it also accepted 2600 joysticks). This adapter caused a flurry of lawsuits between Atari and Coleco, but Coleco eventually won. Expansion Module #2 was a driving controller with a steering wheel and gas pedal which came with Sega's Turbo. Expansion Module #3 was originally intended to be the Super Game Module. The SGM was supposed to add 30K of RAM and use 128K "microwafers" shaped like microcassettes. It promised games with intermissions, high-score lists, and extra levels. At first Coleco said the SGM would come packaged with Super Donkey Kong, but later they changed it to Super Buck Rogers and Super Gorf. Later rumors indicated that the Super Game Module would utilize Capacitance Electronic Disks (CEDs), a storage medium similar to vinyl records that had been developed by RCA as a cheap alternative to laserdiscs. A former Coleco employee recently confirmed that prototype Super Game Modules were test-marketed, but in the end, Coleco shelved the SGM and developed the ADAM computer instead. ADAM became the new Expansion Module #3.

A Prototype of The Super Game Module
A Prototype of The Super Game Module

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