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- Use of vacuum tubes. - Enormous size. - High electricity consumption. - Programming in machine language. (1,0) - Punched cards and printouts.

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- Transistors replace vacuum tubes. - Smaller, faster, cheaper, more energy-efficient and more reliable. - Start using Symbolic or Assembly languages (COBOL, FORTRAN)

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- Development of integrated circuits. - Smaller, faster, cheaper, more energy-efficient and more reliable. - Punched cards are replaced by Keyboards and Monitor. - High level languages were used.  - Multiprogramming. Running more than one application at one time.

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4º Generation - Development of Microprocessor. Thousands of integrated circuits were built onto a single silicon chip. - Development of Portable Computers (PC). IBM. - Computers linked together to form Networks. - Multimedia

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- From present to Beyond - Based on artificial intelligent: Voice recognition, Quantum computation, nanotechnology, etc