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The 1st-generation computer systems (beginning approximately in 1950) employed vacuum tubes as the primary switching component in the processor. Memories were constructed of liquid mercury delay lines or magnetic drums (BESM-1, MINSK-1, IBM 650 are examples).The 2nd-generation systems began around the late 1950's and used transistors instead of vacuum tubes and memories were made of magnetizable cores (BESM-4 and 6, MINSK-32, M-220, IBM 1401 are examples). Size was reduced and reliability was improved significantly in the 2nd-generation systems. The 2nd generation was primarily a batch processing-environment with a single program running at one time.The 3rd-generation computers beginning in the middle of 1960s introduced processors made of integrated circuits (ES-1033, -1045, M-6000, NAIRI-3, SM-3, IBM-360 and 370 are examples). The 3rd generation also introduced system software technologies like Operating Systems and Data Base Management Systems. On-line systems were widely developed throughout the 3rd generation, although most processing was still batch oriented
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