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    After  the  success  of  this  machine,  Hollerith  formed  a  Computing
                    Tabulating Recording Company to sell his machine. Later in 1924,
                    his company became a part of  International Business Machines
                    Corporation, today popularly known as IBM.

                                                                                                         Herman Hollerith

                                                         Hollerith’s Tabulating Machine

                    COMPUTER GENERATIONS

                    After these early calculating machines, the present computer took its shape in five generations.

                    First Generation (1940s)

                    There were many computers that were a part of the first generation computers.

                    MARK-I

                    In 1944, Prof. Howard Aikens built the first electro-mechanical powered computer named
                    Mark-I. It used punched cards and a typewriter for input and output. It was 50 feet long, 8 feet
                    high, weighed 5 tons and could perform operations like addition, subtraction, multiplication,

                    division and referring to previous results. Mark-I was much more reliable than early electronic
                    computers.

                                                                     Mark-I
                    ENIAC

                    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. It had no internal storage and required frequent maintenance.

                                                                                                  Computer Timeline    23

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