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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, that could handle
                  both numeric and textual information.


                  The UNIVAC had 5200 vacuum tubes.
                                                                                               UNIVAC
                  Features of First Generation Computers:
                      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 Computers:

                      Made up of transistors.
                       Magnetic tapes were used to store data.

                       Small in size and less expensive than the first generation
                     computers.
                       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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