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 [[: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]]. However, Chess-Master was a clone of the [[Chafitz ARB Sargon 2.5|Sargon 2.5]] [[6502]] program by [[Dan Spracklen|Dan]] and [[Kathe Spracklen]] <ref>[[Ingo Althöfer]] ('''2020'''). ''Computer Chess and Chess Computers in East Germany''. [[ICGA Journal#42_23|ICGA Journal, Vol. 42, Nos. 2-3]]</ref>.