Changes

In the 80s ''VEB Funkwerk Erfurt'' and ''VEB Mikroelektronik Erfurt'' manufactured various [[Dedicated Chess Computers|dedicated chess computers]] based on their own produced [[Z80]] clone [https://en.wikipedia.org/wiki/U880 U880] <ref>[http://www.robotrontechnik.de/index.htm?/html/komponenten/ic.htm#u880 Integrierte Schaltkreise - Prozessor U880] from [http://www.robotrontechnik.de/index.htm?/html/internes/haupt_en.htm robotrontechnik.de] (German)</ref> <ref>[http://www.z1013.de/u880_befehle.html Der Befehlssatz des U880]</ref>, notably the [[SC 1]] and [[SC 2]], which in turn were [[Clones:Category:Clone|clones]] <ref>[http://www.robotrontechnik.de/index.htm?/html/software/software.htm Copyright und illegal genutzte westliche Software] from [http://www.robotrontechnik.de/index.htm?/html/internes/haupt_en.htm robotrontechnik.de] (German)</ref> of [[Ron Nelson|Ron Nelson's]] [[Chess Challenger]] programs, manufactured by [[Fidelity Electronics]], and since 1983/84 the [[Chess-Master]] models with programs written by [[Dieter Schultze]], [[Rüdiger Worbs]] and [[Wolfgang Pähtz]].