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Ron Nelson wrote the first programs, and was also [[Fidelity Electronics|Fidelity's]] Hardware engineer. After the huge success of the [[Z80]] based ''Fidelity Chess Challenger 7'' <ref>[http://www.schach-computer.info/wiki/index.php/Fidelity_Chess_Challenger_7 Fidelity Chess Challenger 7] from [http://www.schach-computer.info/wiki/index.php/Hauptseite_En Schachcomputer.info Wiki] (German)</ref> , which sold about 600,000 units, the company along with Ron Nelson moved from [https://en.wikipedia.org/wiki/Chicago Chicago], [https://en.wikipedia.org/wiki/Illinois Illinois] to [https://en.wikipedia.org/wiki/Miami Miami] [https://en.wikipedia.org/wiki/Florida Florida] in January 1981. When [[Dan Spracklen|Dan]] and [[Kathe Spracklen]] were hired by Samole in 1980 to adopt their much stronger [[Sargon|Sargon III]] program as Fidelity's flagship, Nelson focused on hardware aspects and presumely I/O and system programming of the machines. In the 80s from time to time, a Fidelity model appeared with his [[Z80]] program.

==2014 * [http://www.talkchess.com/forum3/viewtopic.php?t==12970 Playing Ron Nelson Programs, Today] by [[Fernando Villegas]], [[CCC]], April 08, 2007

: [http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=78 Excalibur Electronics] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], December 22, 2015» [[ACM 1981]], [[Belle|Belle's]] [[Attack and Defend Maps|Attack Maps]]

: [http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=122 Re: Ron Nelson] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], December 24, 2015 » [[Excalibur Mirage]], [[Eric White]]