Z25 (computer)

The Zuse Z25 was a program-controlled electronic computer on the basis of transistors developed by Zuse KG in Bad Hersfeld. It was a "short word" computer with a "single address" instruction set. The word length was 18 bit.[1] The processing of double word lengths was possible (decimal numbers with 10 digits). 32768 addresses could be dialed. On the one hand the computer had a fixed wired memory for standard programs. As main memory a magnetic core memory was used. The maximum size of this memory was 16383 words. A free programmable program memory had a maximum size of 4096 words.[2]

The computer could carry approximately 7100 arithmetic operations per second at a clock rate of 180 kHz. Several Z25 could be connected to a network and the Z25 could be used for the control and data acquisition of external devices by a program interrupt system with up to 32 channels.[2]

In- and output was done by teleprinter, punched tape and punched cards, output also by a type-printer. As mass storage was a drum memory available as well as a magnetic tape memory. The magnetic drum had a storage capacity of 17664 Z25 words. The transmission speed was 6900 words per second. The magnetic tape memory had a capacity of 1 million Z25 words and a transmission speed of approximately 33000 Z25 words per second.[2][3][4] The computer was available at the year 1963.

References

  1. ↑ Zuse, Konrad (1993). The Computer - My Life. Springer. pp. 140–141. ISBN 978-3-540-56453-9.
  2. ↑ 2.0 2.1 2.2 Zuse KG: Einführung in die Arbeitsweise der Zentraleinheit des Datenverarbeitungssytems Zuse Z 25 (Ausgabe April 1963).
  3. ↑ Zuse KG: Zuse Z 25 Standard-Grundprogramm Programmieranleitung (Ausgabe Dezember 1963).
  4. ↑ Zuse Forum 10-1965, p. 34.

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