page_title: Z3 (computer)
section_title: Modern reconstructions
hierarchical_section_title: Z3 (computer) / Modern reconstructions
caption_attribution_description: English: Zuse Z3 computer with Finder relays
context_page_description: The Z3 was a German electromechanical computer designed by Konrad Zuse. It was the world's first working programmable, fully automatic digital computer. The Z3 was built with 2,600 relays, implementing a 22-bit word length that operated at a clock frequency of about 4–5 Hz. Program code was stored on punched film. Initial values were entered manually.
  The Z3 was completed in Berlin in 1941. It was not considered vital, so it was never put into everyday operation. Based on the work of Hans Georg Küssner e.g. a "Program to Compute a Complex Matrix" was written and used to solve wing flutter problems. Zuse asked the German government for funding to replace the relays with fully electronic switches, but funding was denied during World War II since such development was deemed "not war-important".
  The original Z3 was destroyed on 21 December 1943 during an Allied bombardment of Berlin. That Z3 was originally called V3 but was renamed so that it would not to be confused with Germany's V-weapons. A fully functioning replica was built in 1961 by Zuse's company, Zuse KG, which is now on permanent display at Deutsches Museum in Munich.
context_section_description: A modern reconstruction directed by Raúl Rojas and Horst Zuse started in 1997 and finished in 2003. It is now in the Konrad Zuse Museum in Hünfeld, Germany. Memory was halved to 32 words. Power consumption is about 400 W, and weight is about 30 kilograms (66 lb).
  In 2008, Horst Zuse started a reconstruction of the Z3 by himself. It was presented in 2010 in the Konrad Zuse Museum in Hünfeld.
caption: Z3 reconstruction in 2010 by Horst Zuse
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