SM-4
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The SM-4 (CM-4) was a Soviet PDP-11/40 computer clone, developed in Moscow's INEUM (INstitut Elektronnykh Upravlyaushikh Mashin), a leading R&D organization of the Soviet MinPribor, in the second half of 1970s. It was very popular in science and technology.
The standard configuration included 128 or 256 KB core memory, tape puncher, two RK-05 removable 2.5 MB disks and two RK-05F fixed disks, two TU-10 drives and Videoton VDT-340 terminals (VT-52 non-compatible).
The SM-series also included the SM-3, without floating point processing, similar to DEC's PDP 11/40 and 11/34 models. In early production, ferrite core memory was used.
Operating systems commonly used, included:
Similar models included the SM-1420, with semiconductor memory, and the SM-1600, a hybrid of the SM-1420 and the M-6000(?), a system produced in Minsk. The main producer was a Kiev-based factory in Ukraine.
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