OPREMA
OPREMA was the first working computer built in the GDR . The relay calculator was completed in 1955 . Its name is derived from OP tik- RE chen- MA chine , a reference to the intended use: calculations for lens systems.
The computer was developed by a team led by Wilhelm Kämmerer and Herbert Kortum for the Carl Zeiss company in Jena from around 1954. The data was entered via pin boards and output via a teleprinter .
What is remarkable is the fact that the OPREMA initially consisted of two identical systems, which carried out each work step redundantly and compared the results with one another. Together, the two systems had 17,000 relays . After the test operation had shown that both "sub-computers" were working reliably, the two computers were separated and two independent systems were available.
The average clock frequency was 100 Hertz , which led to computing times of 120 ms for an addition , 800 ms for a multiplication or division and 1,200 ms for the extraction of the square root .
Web links
- Computer OPREMA. In: Robotrontechnik.de - The history of computer technology. Retrieved June 16, 2013 .
- The first GDR computer had cables 500 kilometers long. In: Heise Online. April 4, 2013, accessed June 16, 2013 .
- Andreas Göbel: You could count on this monster. In: one day (Spiegel Online). June 14, 2013, accessed June 16, 2013 .
- Jürgen FH Winkler: The Oprema - the relay computer from Zeisswerk Jena. (PDF; 2.1 MB) In: University of Jena. Retrieved on June 16, 2013 (author's lecture at Jena University).