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    Second Generation (1950s)

                    After 1955,  the 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. They were                         Magnetic tape

                    smaller, faster, more reliable and more energy-efficient.

                                             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. They were smaller, cheaper and more efficient
                    than the previous two generations and were sometimes called
                    minicomputers.                                                                   Integrated Circuits

                                 Features of Third Generation Computer

                                      These computers were made of ICs.
                                      The use of the ICs reduced the size and increased the speed of the
                                    computers.
                                      They were more affordable and dependable.

                    Fourth Generation (1970s)

                    In  the  1970s,  Very  Large  Scale  Integration
                    (VLSI) came into existence in which thousands
                    of transistors were placed on a single chip called         Microprocessor
                    a  microprocessor. They were sometimes

                    called microcomputers.

                                                                                                            IBM PC

                                                                                                  Computer Timeline    25

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