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A microprocessor is a CPU on a single chip. It is built as an integrated circuit (IC), possibly comprising millions
                   of circuits. A microcontroller is a small computing device consisting of a CPU, RAM, ROM and other peripherals
                   embedded in some other device such as an air conditioner, a washing machine, or an automobile. A microcontroller
                   typically performs a dedicated task without human intervention.



            1.3 Input Devices

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            1.3.1 Keyboard
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                   A Braille keyboard is an input device that helps visually impaired people for entering data into a computer.


            1.3.2 Mouse
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            1.3.3 Scanner
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            1.3.4 Light Pen

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            1.3.5 Optical Mark Reader (OMR)

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                   A smart card reader is used to fetch input from credit cards, debit cards or ATMs.



            1.3.6 Touch Screen

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                                                                                 Introductonnton oomuttrn Syttoy  11
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