Word length 18 bit, 38 basic instructions, up to 1024 index strorage cells Maximum
working speed 7100 operations/s.
Ferrite core working store for extension up to 16384 words Ferrite core fixed store
for extension up to 4096 words.
Auxiliary magnetic drum store holding 17664 words.
Magnetic tapes with a working speed of 100 000 characters/s Input and output via
punched tape, punched cards, line printer Connection of data sampling systems for
Several ZUSE Z 25 can be coupled together.
The central unit occupies very little space.
The extraordinarily wide range of extension facilities, both as regards the stores
and the peripheral equipment, assure the ZUSE Z 25 a widespread field of applications.
The low purchase price of the central unit allows to be augmented economically to
form multiple systems with, depending on the nature of the problem, may processes
identicval or different programs in true simultaneous operation.
For Science and Engineering
Small-scale computer for use in institutes, low cost and small s ize.
In conjunction with the film translator ZUSE Z 84, the electronicplanimeter ZUSE
Z 80 and the "Graphomat" ZUSE Z 64, it can be usedto achieve complete automation
in surveying. With appropriatelyincreased storage capacity it makes an ideal technical
In the Commercial Field
High internal data processing speed obtained with the aid of special instructions
for double length arithmetic. High-speed data input by punched-tape reader for 300
or 1000 characters/s,high-speed data output by tape punch for150 characters/s and
line printer working at 5 lines/s.
Quick sorting with high-speed magnetic tapes. The writing or reading speed is 100
Owing to the low price of the central unit, true simultaneous operation of the system
can be obtained by using several central units type Z 25 coupled together.
For process Control
Automatic sampling of measurands and data of a process, as well as transfer to the
central unit over Jong distances by the flexible data sampling system.
Satellite systems can be formed by coupling several ZUSE Z 25 together. The interchangeability
of all components of the system, including the central unit Z 25, assures maximum
possible reliability, which is absolutely essential in the field of process control.
Length of word 18 bit, word time 140 µs
Representation of numerical data: binary (corresponding to appr.5 decimals/word)
1 bit address modification
5 bit function part
10 digit address (unmodified)
38 instructions, including double-length instructions.
Wired multiplication and division.
Transfer of instructions from store and execution in 1 word time.
32 interruption channels for breaking into programme.
Input and output channels for direct data transfer between several ZUSE Z 25 at internal
Ferrite core working store, max.capacity 16384 words.
Extension stages: 256/1024 an 4 x 4096 words.
Ferrite core fixed store holding 2048 or 4096 words.
Magnetic drum store for 17664 words.
Average access time per block 5 ms.
Magnetic tape unit with a reading or writing speed of 100 000 characters/s.
Capacity per 170 m tape (1/2 in.) appr.1 million words.
Punched-tape reader for 10, 300 or 1000 characters/s Punched-card reader for 12 000
Input of analogue values from data sampling systems.
Tape punch for 10 or 150 characters/s
Teleprinter for 10 characters/s
High-Speed printer for 100 characters/s
Line printer for 5 lines/s
Output of analogue values via data distribution systems Analogus on-line and off-line
output via automatic
plottingtable ZUSE Z 64 Graphomat
Output register for digital values for control of relays.
Control desk with 18-bit indicator for register and storage cells Regulated power
Printed circuit cards
Hinged chassis which simplify maintenance.
Areas of application
A general purpose computer for application in all areas of science, technology, process
control, administration and commercial application. It was possible to extend the
Z25 with additional memory, magnetic cylinder and magnetic tape and other peripheral
devices. Complex systems for process control could be realized through coupling of
several Z25 and devices for data input. Direct output of calculation results to the
Graphomat Z64 possible.