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    Arithmetic Logic Unit (ALU)

                     The  ALU does arithmetic calculations  like addition,  subtraction,  multiplication,

                     division and so on. It also does comparisons like greater than, less than, equal to

                     and so on.
                     Memory Unit (MU)

                     The MU stores data and instructions given to the computer and the result of the
                     processing.

                     Control Unit (CU)

                     The  CU coordinates between all the parts of the CPU. The CU gets data  and
                     instructions from the memory unit and passes them on to the ALU in a step by

                     step manner.
                     Output

                     The result which we get after processing the data and instructions is called output.

                     The output which is displayed on the screen of a monitor is called the soft copy. A
                     printout of the soft copy on paper is called the hard copy.

                     Some of the output devices are monitor, printer, speakers, etc.

                             Monitor                              Printer                           Speakers

                           FUNCTIONING OF THE IPO CYCLE

                     Have you seen your mother making mango shake for you? This is what she does to
                     make the mango shake.

                     1.  She puts the mango pieces, sugar and milk in the blender. (This is the input.)
                     2.  The blender mixes all the things. (This is the process.)

                     3.   She pours the mango shake in the glass. Mango shake is ready to drink. (This is
                         the output.)

                                                                                               A Computer System          9

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