Z25 (computer)

The Zuse Z25 was a program-controlled electronic computer using transistors developed by Zuse KG in Bad Hersfeld and put into production in 1963. The word length was 18 bits,[1] though it could also process double-word lengths for accuracy up to 10 decimal digits. The addressable space was 32768 words. The maximum size of the magnetic core memory was 16383 words. The programmable program memory had a maximum size of 4096 words.[2]

Z25
DeveloperKonrad Zuse
ManufacturerZuse KG
Release date1963 (1963)
Units sold110 in Germany, 10 in foreign countries (2 in Moscow)
CPU@ 180 kHz
StorageDrum memory
Removable storageMagnetic tape memory, punched tape and punched cards
DisplayTeleprinter
RelatedZ22, Z26
Ferrite-core memory included in the Z22, Z23 and Z25

For mass storage there 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] In- and output was through punched tape and punched cards; it was also possible to print to a teleprinter.

The computer could carry out approximately 7100 arithmetic operations per second at a clock rate of 180 kHz. Several Z25s could be connected in a network. The Z25 could be used for the control and data acquisition of external devices through a program-interrupt system with up to 32 channels.[2]

References
  1. Zuse, Konrad (1993). The Computer - My Life. Springer. pp. 140–141. ISBN 978-3-540-56453-9.
  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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