Nowadays every large Organisation wishing to maintain its key position an the market
has electronic installations for data processing as standard equipment. In order
to allow the working of such installations in small and medium size organisations,
ZUSE KG have developed the ZUSE Z 31 computer. This reasonably priced machine is
program-controlled and has a very high degree of efficiency. Transistor technology
is used for its construction. lt is made up of a carefully chosen assembly of units
which enables numerous special applications to be carried out at low cost.
The ZUSE Z 31 can adapt itself to the type and importance of any kind of activity
and its possibilities of further extension avoid any fear of under sizing or over
sizing. The simplicity of servicing and the ease of maintenance give this computer
an altogether special value. The internal use of the decimal System allowing very
high input and Output speeds, enables this all purpose machine to handle a wide range
of problems. One of the great advantages for the user of the ZUSE Z 31 is that it
is possible to utilize existing punch tape devices irrespective of the code used
by these devices.
For large organisations, the moderate cost of this computer permits a decentralization
of the fields of activity which simplifies considerably the Organisation and transfer
Installations for commercial data processing are characterised by the fact that
in general their programs contain relatively few instructions. Indeed even if these
instructions require a large volume of data the latter is processed in blocks, following
the same method and therefore the machine will only be asked to store relatively
small programs. However most of the time it is necessary to have a store with a very
arge capacity (e. g. storage of the different articles of a arge shop, accounts of
a bank etc.)
The greatest flexibility is required from the input and Output devices which are
parts of primary importance in computers for commercial work. The System of layout
units used in the construction offers the ideal solution that can satisfy the most
exacting requirements. As it is a decimal Computer the installation is especially
designed for the processing of a large volume of input and output data and is consequently
suitable for the solution of commercial problems. The store capacity can be extended
at will by connecting additional stores and the input and output speeds can be increased
to 1.000 characters/s by the addition of corresponding devices. A simple instruction
Code facilitates operation. A comparison device offers great advantages for research
processes or translation programs.
Equipped with two accumulators it can for example process simultaneously arithmetical
and logical operations in the arithmetic unit. With one instruction the contents
of the accumulators can be added in each cell of the fast store. Each instruction
can be conditional depending an the contents of the special condition stores or
those of the accumulators. During programming, instructions and stores can be economised
by address substitution and adress modification. Reconversion programs allow the
use of a practical external code as required.
Principal technical data
Execution of the instruction in the stored sequence until a jump order occurs. At
the time of a jump for sub-routine, automatic recording of the sequence address in
the return adress store.
Two independant counting registers with shifting devices and units for addition,
intersection and complement belonging to them. Index registers for address modification.
A fast multiplication unit is available as an addition.
The ferrite core working store has a capacity ranging from 200 to 9.000 store cells
including 10 index registers for address modification. Each store cell comprises
10 + 1 decimal digits. According to requirements store extension is possible by adding
auxiliary stores (magnetic drum of 6.750 words each, magnetic discs store with a
capacity of 1 to 4.000.000 words, magnetic tape units with a store capacity of 750.000
words per tape), program store (fixed wiring ferrite core store) for storing basic
programs as well as programs and constants frequently used, 2 individual and interchangeable
units of 1.300 words each can be placed simultaneously in the machine. Two counting
registers and 6 condition stores as programmable indicators.
Address keyboard for selection of the store cells and the registers. Stored information
can be displayed an a decimal display panel. lt can be modified by means of a keyboard
with decades. The program can be easily and quickly controlled by an address stop
device, 6 condition switches and 18 control indicators.
Input and output possibilities
Punched tape Possibilities of input and output with buffers for character, word and
block. Several tape readers and tape punchers can be connected. Input speed up to
1.000 characters/s, output speed up to 150 characters/s.
Input and output with complete storage of a card in the buffer store. Several punched
card readers and card punchers can be connected.
Up to 48.000 cards/h. Ouput speed: up to 15.000 cards/h.
Several typewriters can be connected. Output speed: 10 characters/s.
Output with buffer store for one line. Printing speed up to 60.000 alphanumeric lines/h.
A !arge number of analogue input and output devices can be used for the automatic
collecting and processing of measurement values.
Keyboard perforators and tape punching adding machines or typewriters, tape controlled
Typewriters, or fast printer for punched tape processing. Furthermore, the programming
System allows the production, control, copying, modification, and transcription of
the tapes. The tape or card-controlled ZUSE Z64 GRAPHOMAT is particularly well suited
for the graphic reproduction of digital values.
Control unit Arithmetic unit
Areas of application:
Banks, insurance companies, research, industry, trade, public service. Compilers
for German formula code and ALGOL 60 are available for the Z31.