Computermuseum der Fakultät Informatik deutsch

Diehl Combitron =S=


The complete Combitron equipment At the left the Diehl Dilector, a paper tape reader to enter numbers and programs. It is coupled to the keyboard and sends the corresponding keycode according to the perforation to the computer. In front of the Dilector one of those little helpers of data processing: a manual punch for paper tapes. The book from Dietrich Marsal in the middle (former visiting professor at the University of Stuttgart) contains descriptions and examples to several electronic calculators, amongst them the Diehl Combitron. One of the examples is a program to calculate the faculty of 1 to n, i.e. 1!, 2! and so on.

Diehl Dilector
The Diehl Dilector

With the help of the wheel, one of up to nine programs can be selected which the Dilector will seek to automatically. Therefore a special code with the desired program number can be punched ahead of the data. When pressing the red start button the Dilector skips everything until it finds the correct number and transmits the following codes to the computer.

The keyboard and the digit indicator

Since the entry of a number is done invisibly, i.e. the digits entered so far are not visible anywhere, a workaround has been implemented with the digit indicator. It displays the number of entered digits with a light spot (which travels from the right to the left).

Some technical details

Mounting diagram
Mounting diagram of the CPU

The red markings denote most of the signals within the CPU; see also the schematics below.

Overview of CPU
Overview of the CPU

In the top third of the board are the clock and phase generators, in the bottom third are the flip-flops of the CPU, and the rest of the diode gates form the logic of the machine.

Schematic CPU
Schematic diagram of the CPU including read/write amplifiers

The work of a pure genius called Stanley Frankel - a complete computer that implements the four basic arithmetic operations as well as several transfer, test and jump orders.

Mounting diagram read amplifiers
Mounting diagram of the read amplifiers

more pictures...

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