Following are the main five generations of computers
Serial Number
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Generation & Description
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1
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First Generation The period of first generation : 1942-1954. Vaccum tube based.
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2
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Second Generation The period of second generation : 1952-1964. Transistor based.
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3
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Third Generation The period of third generation : 1964-1972. Integrated Circuit based.
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4
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Fourth Generation The period of fourth generation : 1972-1990. VLSI microprocessor based.
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5
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Fifth Generation The period of fifth generation : 1990-onwards.ULSI microprocessor based
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