Z25

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Z25 in the depot of the Museum for Communication Bern

The Z25 was a program-controlled electronic computer from Zuse KG in Bad Hersfeld on the basis of transistors , which was built in series from 1963. The word length was 18 binary digits. It was possible to process double word lengths (decimal numbers with 10 digits). 32,768 addresses could be selected. On the one hand, the computer had a hard-wired memory for standard programs. A ferrite core memory served as the main memory . The maximum size of this memory was 16,383 words. In contrast to the hard-wired memory, a freely programmable program memory had a maximum size of 4096 words.

The computer was able to perform around 7100 arithmetic operations per second at a clock frequency of 180 kHz. Several Zuse Z25 could be interconnected to a multi-computer system and the Zuse Z25 could be used to control and data acquisition of external devices. The prerequisite for this was a system for program interruption by other devices with up to 32 channels.

Inputs and outputs could be made using a teleprinter , punched tape and punched cards , and output could also be made using a character printer . A drum storage unit was available as mass storage and a magnetic tape storage unit could be used. The drum memory had a storage capacity of 17,664 Z25 words. The transmission speed was 6900 words per second. The magnetic tape memory had a capacity of one million Z25 words and a transmission speed of around 33,000 Z25 words per second.

The calculator was available from 1963 at the latest. A Zuse Z25 was among other things at the Mineralogical Institute of the University of Marburg . This computer was used to control several single crystal diffractometers . The crystal structure analyzes based on the data were carried out by Rudolf Allmann , Hans Burzlaff , Erwin Hellner and Werner Fischer on a Telefunken TR4 , among others .

Individual evidence

  1. ↑ a b c Zuse KG: Introduction to the operation of the central unit of the data processing system Zuse Z 25 (edition April 1963).
  2. ↑ Zuse KG: Zuse Z 25 Standard Basic Program Programming Instructions (December 1963 edition).
  3. ↑ Zuse Forum 10-1965, p 34th
  4. ↑ University Computing Center University of Marburg: Historical Development of the HRZ. October 13, 2013, accessed January 11, 2015 .

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