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'''Chess-Master''',<br/>
a [[Dedicated Chess Computers|dedicated chess computer]] series manufactured in the 80s by [[VEB Mikroelektronik Erfurt|VEB Mikroelektronik „Karl Marx“ Erfurt]], [https://en.wikipedia.org/wiki/East_Germany East Germany], in [https://en.wikipedia.org/wiki/West_Germany West Germany] sold by Radiophon. Chess-Master ran on an 8-bit [https://en.wikipedia.org/wiki/U880 U880] CPU, which was an unlicensed [[Z80]] clone, and had 10 KB [[Memory#ROM|ROM]] and 2 KB [[Memory#RAM|RAM]]. The chess program was initially written by authors were [[Dieter Schultze]] and [[Rüdiger Worbs]].
[[Piece Recognition|Automatic piece recognition]] was implemented with [https://en.wikipedia.org/wiki/Hall_effect_sensor Hall effect sensors] under each square of the chessboard, while pieces had two reverse directed [https://en.wikipedia.org/wiki/Magnet permanent magnets] with different compensation embedded, so that a cyclic running multiplexed I/O program, also polling the keyboard, could recognize the pieces <ref>[http://www.robotron-net.de/sonstiges.html#CM OEM und Sonstiges - Schachcomputer "ChessMaster"] from [http://www.robotron-net.de/ Robotron-net.de] (German)</ref> <ref>[http://www.robotron-net.de/Service/Dokus/CM-Sp.jpg Chess-Master circuit diagram] hosted by [http://www.robotron-net.de/ Robotron-net.de]</ref> .
