Development
In 1966, the Soviet economists suggested creating a unified series of mutually compatible computers. Due to the success of the IBM System/360 in the USA, the economic planners decided to use the IBM design, although some prominent Soviet computer scientists had criticized the idea and suggested instead choosing one of the Soviet indigenous designs, such as БЭСМ or Minsk. The first works on the cloning began in 1968; production started in 1972. In addition, after 1968, other Comecon countries joined the project.
During 1960s-1970s, several other companies, such as Amdahl, Siemens and Hitachi, had also cloned the IBM architecture without IBM's approval. With the exception of only a few hardware pieces, the ES machines were recognized in the Western countries as independently designed, based on legitimate Soviet patents. Unlike the hardware, which was quite original, mostly created by reverse-engineering, much of the software was based on slightly modified and localized IBM code. In 1974-1976 IBM had contacted the Soviet authorities and expressed interest in ES EVM development; however, after the Soviet Army entered Afghanistan, in 1979, all contacts between IBM and ES developers were interrupted, due to the US embargo on technological cooperation with the USSR.
Due to the CoCom's restrictions, much of the software localization was done through disassembling the IBM software, with some minimal modification. The most common operating system was ОС ЕС (OS ES), a modified version of OS/360; the later versions of ОС ЕС were very original and different from the IBM OSes, but they also included a lot of original IBM code. There were even anecdotal rumors among the Soviet programmers, that this supposedly Soviet operating system contained some secret command, which outputs the American national anthem. Today some of the Russian institutes that worked on ES EVM are cooperating with IBM to continue legacy support for both genuine IBM mainframes and the ES EVM systems.
The ES EVM were developed in Moscow, at the Scientific-Research Center for Electronic Computer Machinery (НИЦЭВТ), in Yerevan, and later in Minsk, Belarus, at the Scientific-Research Institute of Electronic Computer Machines (НИИ ЭВМ), in Penza Scientific-Research Institute of Computer Machinery (Пензенский НИИВТ) and manufactured in Minsk, at Minsk Production Group for Computing Machinery (Минское производственное объединение вычислительной техники (МПО ВТ)), in Penza, at Penza Electronic Computer Plant (Пензенский завод ВЭМ). Some models had been also produced in other countries of the Eastern bloc: Bulgaria, Hungary, Poland, Czechoslovakia, Romania and East Germany; some peripheral devices were also produced in Cuba.
The ES computers were produced in subseries, known as Ряд 1, Ряд 2, Ряд 3, Ряд 4 (Ryad means series).
Read more about this topic: ES EVM
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