1978: data storage-board of the SM4
The SM-4
The SM4 was a computer, that was produced without licence in countries of the Warsaw Pact in the second half of 1970s. The archetype for it was the PDP-11, produced in 1970/71 by the american company DEC (Digital Equipment Corporation), because of its great importance in the fields of sience and research. The technological principle of the PDP-11 is relativly simple: There is a stadardized bus-system, which serves the transport of data and energy between many parts in the computer, in this case between processor, primary storage and the input and output devices. The processor could treat 16 bits within one clock. The main storage-board of the SM4 is an magnetic-core memory, as it was usual in that time. The most models of the SM4 had a capacity of 128 or 256 kB.
