Z5 (computer)

Z5
DeveloperKonrad Zuse
ManufacturerZuse KG
ReleasedJuly 1953 (1953-07)
Lifespan5 years
Introductory price
DM 300,000 (equivalent to DM 812,445 in 2021)
CPU@ ca. 40 Hz
Memory720 relays, 36 bit word length, 12 cells
Power5000 watts
PredecessorZ4

The Z5 was an electromechanical relay computer designed by Konrad Zuse and manufactured by Zuse KG following a commission from Ernst Leitz GmbH in Wetzlar in 1950. Delivered in July 1953, it was the first commercial built-to-order mainframe in Germany. The machine was purchased to support the design and optimisation of optical lens systems, a computationally intensive task that had previously required large teams of human computers.