D1 (computer)
The D1 - actually programmable computing machine D1 (Dresden 1) - was an early, incurred in-house development computer of the GDR . In contrast to the OPREMA relay computer from Zeiss , which was commissioned in 1955, the D1 was already based on vacuum tubes.
It was designed and built between 1950 and 1956 at the TH Dresden together with the VEB Robotron-Meßelektronik "Otto Schön" Dresden . Its designer was Nikolaus Joachim Lehmann , father of many computers from Dresden . The D1 was a tube computer . With around 760 electron tubes , he was able to perform 100 to 200 arithmetic operations per second. A magnetic drum memory , which stored 2100 words, was used for data storage. One word corresponded to 72 bits or three commands . In addition, the D1 already had an assembler-like programming.
The successors to the D1 were the D2 , D3 and D4 .