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They are computer vased in electronic vacuum valves. They were enormus,
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They don´t use the vacum valves and they use transistor they were smaller and they go fastter than the fist generation computers.
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Is based in integrated circuits that teh revolutionize the computers they were more faster and thy were more reliable.
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They present all the cpu in an integrated circuit they are microprocessers
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They have more than one microprocesser and they almacenait in a lot of gygabaits