Z3 Computer Presentation

First working programmable, fully automatic digital computer

Science & Technology

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Overview

What happened

The Z3 was a German electromechanical computer designed by Konrad Zuse in 1938, and completed in 1941.

Date

May 12, 1941

Location

Berlin, Germany, at the German Aeronautics Research Institute.

Key people

Konrad Zuse, inventor, and Helmut Schreyer, contributor, played crucial roles.

Why it matters

This article provides a detailed account of the May 12, 1941 presentation of Konrad Zuse's Z3 computer, drawing on primary sources such as Zuse's memoirs and the Vossische Zeitung's report, as well as secondary sources including commentary from historians Friedrich Bauer, Paul Ceruzzi, Donald Knuth, and Martin Campbell-Kelly. By examining the event through multiple perspectives, including the experiences of attendees like Helmut Schreyer and German government officials, this article offers a nuanced understanding of the Z3's development and impact. The article's structure, which combines narrative, technical analysis, and balanced evaluation, enables readers to appreciate the Z3's innovations and limitations, and to consider its significance within the broader context of computer science history. In contrast to a standard encyclopedia entry, this article's approach provides a richer understanding of the Z3's presentation and its aftermath, making it a valuable resource for readers seeking to explore this pivotal moment in the history of computing.

What was Z3 Computer Presentation?

The Z3 was a German electromechanical computer designed by Konrad Zuse in 1938, and completed in 1941. 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 5–10 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 the German aerodynamics engineer Hans Georg Küssner (known for the Küssner effect), a "Program to Compute a Complex Matrix" was written and used to solve wing flutter problems.

Background and consequences

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 (Versuchsmodell 3 or Experimental Model 3) but was renamed so that it would not 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. The Z3 was demonstrated in 1998 to be, in principle, Turing-complete. However, because it lacked conditional branching, the Z3 only satisfies this definition by speculatively computing all possible outcomes of a calculation.

Why it matters

Thanks to this machine and its predecessors, Konrad Zuse has often been suggested as the inventor of the computer.

Related on thisDay

Z3 Computer Presentation — May 12, 1941

Konrad Zuse unveiled the Z3, world's first programmable computer, in Berlin, Germany in 1941, revolutionizing technology completely

Sources and further reading

Use the dated article for the day-specific account; use these references to check the event record and explore its wider historical context.

Date article: Z3 Computer Presentation — May 12, 1941 Wikipedia source

Cite this page

MLA

“Z3 Computer Presentation.” thisDay, thisday.info/history/z3-computer-presentation/. Accessed 19 Oct. 2026.

APA

Z3 Computer Presentation. (n.d.). thisDay. Retrieved October 19, 2026, from https://thisday.info/history/z3-computer-presentation/

Chicago

“Z3 Computer Presentation.” thisDay. Accessed October 19, 2026. https://thisday.info/history/z3-computer-presentation/.

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