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UMC (Uniwersalna Maszyna Cyfrowa - Polish for Universal Digital Machine) is a family of computers produced by Elwro from 1962. It consisted of vacuum-tube based UMC-1 and transistor-based UMC-10. UMC computers in 1964 operated using negabinary (-2 base) numeral system invented by prof. Zdzisław Pawlak.
References
UMC (computer) Wikipedia(Text) CC BY-SA