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    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
                                                                                                   Integrated Circuits
                      previous two generations and were sometimes called
                      minicomputers.

                                 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 a
                      microprocessor. They were sometimes                    Microprocessor
                      called microcomputers.
                      IBM released their first line of desktop

                      PC, which used Intel 8088 chip as CPU.
                      In 1983, IBM introduced the  PC-XT,                                                IBM PC
                      which had more memory and more hard drive space.

                      In 1985, Microsoft released the first version of Microsoft Windows.

                                 Features of Fourth Generation Computer

                                     VLSI called microprocessors invented.
                                     Small in size and could be placed on an office table.

                                     Hard disk to store data.
                                     Introduction of GUI operating system.

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