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1st (1942-1955) Eniac it was the first generation computer with vacum tubes.
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2nd (1956-1964) the computers used transistors.
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3rd (1965-1975) the computers have integrated circuit.
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4th (1976-the present) the compuers have microprocessors.
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5th (the future) the computers will have artificial inteligence (AI) like a robots.