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### Z3 (computer)

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Z3 (computer)
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• BOOK,weblink Portraits in Silicon, Slater, Robert, 1989, MIT Press, 9780262691314, 46â€“47, en,

## Z3 as a universal Turing machine

It was possible to construct loops on the Z3, but there was no conditional branch instruction. Nevertheless, the Z3 was Turing-complete â€“ how to implement a universal Turing machine on the Z3 was shown in 1998 by RaÃºl Rojas.WEB,weblink How to Make Zuse's Z3 a Universal Computer, Rojas, RaÃºl, He proposes that the tape program would have to be long enough to execute every possible path through both sides of every branch. It would compute all possible answers, but the unneeded results would be canceled out (a kind of speculative execution). Rojas concludes, "We can therefore say that, from an abstract theoretical perspective, the computing model of the Z3 is equivalent to the computing model of today's computers. From a practical perspective, and in the way the Z3 was really programmed, it was not equivalent to modern computers."From a pragmatic point of view, however, the Z3 provided a quite practical instruction set for the typical engineering applications of the 1940s â€“ Zuse was a civil engineer who only started to build his computers to facilitate his work in his main profession.

## Specifications

• Average calculation speed: addition â€“ 0.8 seconds, multiplication â€“ 3 secondsBOOK, Morelli, Marcello, Dalle calcolatrici ai computer degli anni Cinquanta, 2001, FrancoAngeli, 9788846428790, 177,weblink 5 August 2014,
• Arithmetic unit: Binary floating-point, 22-bit, add, subtract, multiply, divide, square root
• Data memory: 64 words with a length of 22 bits
• Program memory: Punched celluloid tape
• Input: Decimal floating-point numbers
• Output: Decimal floating-point numbers
• Input and Output was facilitated by a terminal, with a special keyboard for input and a row of lamps to show results
• Elements: Around 2,000 relays (1,400 for the memory)
• Frequency: 5.3 hertz
• Power consumption: Around 4,000 watts
• Weight: Around {{convert|1|t|lb}}

## References

{{reflist|colwidth=30em}}

• BOOK, B. Jack Copeland, Colossus: The Secrets of Bletchley Park's Codebreaking Computers, 2006, Oxford University Press, 978-0-19-284055-4,
• JOURNAL, R. Rojas, F. Darius, C. GÃ¶ktekin, G. Heyne, yes, The reconstruction of Konrad Zuse's Z3, IEEE Annals of the History of Computing, 27, 3, 23â€“32, 2005, 10.1109/mahc.2005.48,

{{commons category|Zuse Z3}}

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