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In page Intellivision:

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Also in 1997, Intellivision Productions announced they would sell development tools allowing customers to program their own Intellivision games. They were to provide documentation, PC compatible cross-assemblers, and the Magus II PC Intellivision cartridge interface. Unfortunately, the project was cancelled but they did provide copies of "Your Friend the EXEC", the programmers guide to the Intellivision Executive control software.[4] By 2000 Intellivision hobbyists ultimately created their own development tools,[5] including Intellivision memory cartridges.[citation needed]