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ENIAC— The First Electronic Computer

                                                    Electronic Numerical Integrator And Computer,

                                                    was  the  first  electronic  general  purpose  digital
                                                    computer built in 1946 by  John  Mauchly and
                                                    Presper Eckert. It contained over 18,000 vacuum
                                                    tubes  and  was  1000  times  faster  than  Mark-I.

                                                    ENIAC consumed almost 200 kw of power.
                         ENIAC

            UNIVAC


            UNIVAC or Universal Automatic Computer, was
            another successful invention of John Mauchly
            and Presper Eckert in 1951, which could handle

            both numeric and textual information.

            The UNIVAC had 5200 vacuum tubes.
                                                                                         UNIVAC
            Features of First Generation Computer
                Huge in size.

                Very expensive.
                Made up of vacuum tubes.

            Second Generation (1950s)
                                                                                                  Vacuum tube
            After  1955,  use  of  transistors  and  magnetic  tapes

            changed the image of the electronic computer.
            During this period, the major computer manufacturers

            began to  offer  a  range  of  accessories  such as:  Page
            Printers, Cathode Ray-Tube display, Card Feeders, etc.
                                                                                          Magnetic tape
            Features of Second Generation Computer
                 Made up of transistors.

                 Magnetic tapes were used to store data.
                 Small in size and less expensive than the first generation
               computer.

                 Faster and reliable.                                                               Transistor

            Third Generation (1960s)

            In the third generation, the invention of Integrated Circuits
            (IC) led to smaller-sized computers with better functioning

            and more storage.                                                               Integrated Circuits

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