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1940-1956
the first generation of computers used vacuum tubes for circuitry and magnetic drums for memory, and was often enormous, taking up entire rooms. -
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Transistors replaced vacuum tubes and ushered in the second generation of computers.
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the development of the integrated circuit was the hallmark of the third generation of computers. Transistors were miniaturized and placed on silicon chips, called semiconductors, which drastically increased the speed and efficiency of computers.
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The microprocessor brought the fourth generation of computers, as thousands of integrated circuits were built onto a single silicon chip. What in the first generation filled an entire room could now fit in the palm of the hand.
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