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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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