UMC (Uniwersalna Maszyna Cyfrowa - Polish for Universal Digital Machine) is a family of

computer A computer is a machine that can be Computer programming, programmed to automatically Execution (computing), carry out sequences of arithmetic or logical operations (''computation''). Modern digital electronic computers can perform generic set ...

s produced by

Elwro Elwro was a Polish company that manufactured mainframe and microcomputers from 1959 until 1989. Its plant was in Wrocław. Computer models included Odra (computer), Odra mainframe systems, and the List of ZX Spectrum clones#Elwro 800 Junior, Elwro ...

from 1962. It consisted of vacuum-tube based UMC-1 and

transistor A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch electrical signals and electric power, power. It is one of the basic building blocks of modern electronics. It is composed of semicondu ...

-based UMC-10 (1964). UMC computers operated using negabinary (-2 base)

numeral system A numeral system is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. The same sequence of symbols may represent differe ...

invented by prof. Zdzisław Pawlak.

References

Early computers {{compu-hardware-stub