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Joystick

            Joystick is a pointing device which is used to control the movement

            of a pointer on your computer screen. It is mostly used to play
            games on the computer.





                              Microphone                                                            Joystick


                              It is an input device that is used to record voice, music and sound
                              into the computer system.


             Microphone

            Touchscreen

            A touchscreen is a screen sensitive to touch. We can interact

            with a computer by touching areas on the screen. Tablets,
            smartphones, ATMs have touchscreen in them.


                                                                                             Touchscreen
                PROCESSING DEVICE


            Processing is done on the data  entered  into the computer,  to convert  it into
            meaningful information through a processor.

            CPU

            CPU (Central  Processing Unit)  is

            a  processor, sometimes  called a                                                  Memory Unit
            microprocessor. It is  the brain
            of the computer that does all the
                                                                                                Control Unit
            calculations, and runs all the programs.
            It manages all the operations and
            carries  out the  basic instructions                                                    ALU
            which operate a computer. The three
                                                                 CPU box          CPU       Functioning of CPU
            main components of CPU are:

                ALU (Arithmetic Logic Unit):  Performs mathematical and logical operations.
                CU (Control Unit): Directs all the operations of a processor.

                Memory Unit: Stores data and instructions.




                                                                          The Computer— An Overview           9
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