A popular trend in the early 1980's was for a manufacturer to release an add-on that would turn it's video game console system into a computer system. Such things were produced for the Atari 2600VCS and have been rumored to exist for others such as the Vectrex.

• Atari XE Game System
• Colecovision Expansion Module #3
• Commodore CDTV
• Mattel Intellivision Computer Module

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