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a [[Dedicated Chess Computers|dedicated chess computer]] module system designed by [[John Aker]] (electronics) and [[Alan Mead]], manufactured by [[Applied Concepts]] and distributed by [[Chafitz]], otherwise identical in construction with the akin [[Great Game Machine]]<ref>[[Harry Shershow]] ('''1981'''). ''Two New Units In Action''. [[Personal Computing#5_2|Personal Computing, Vol. 5, No. 2]], pp. 91 » [[John Aker]], [[MCC 1980]]</ref>. The MGS had exchangeable modules with programs from multiple authors, [[Sargon|Sargon 2.5]] by [[Dan Spracklen|Dan]] and [[Kathe Spracklen]], [[Boris|Boris 2.5]] based on Sargon 2.5 improved by [[John Aker]] and [[Terry Fredrick]], [[Morphy]] by [[John Aker]], the opening module [[Morphy#Gruenfeld|Gruenfeld]] by [[Larry Atkin]], [[David Slate]] and [[John Jacobs]], the endgame module [[Morphy#Capablanca|Capablanca]] by Atkin and Slate, and the [[Steinitz]] module by Atkin, all [[6502]] based. There were also other game modules available, such as [[Checkers]] <ref>[http://www.schaakcomputers.nl/hein_veldhuis/database/files/12-1980%20%5BK-1001%5D%20Applied%20Concepts%20-%20Borchek%20%28championship%20checkers%20module%29.pdf Applied Concepts - Borchek (championship checkers module)] (pdf) by [[Hein Veldhuis]]</ref> , and the [[Othello]] program [[Peter W. Frey#Odin|Odin]] by [[Peter W. Frey]] and Larry Atkin.