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Devices Input and Output UNIT 4 INPUT OUTPUT DEVICES

75 INPUT and OUTPUT DEVICES UNIT 4 INPUT OUTPUT DEVICES Structure Page No. Introduction 76 Objectives 76 INPUT OUTPUT DEVICES 76 What is a Port ? 78 Parallel Port 78 Serial Port 79 Universal Serial Bus (USB) 79 Small Computer System Interface (SCSI) Port 79 INPUT DEVICES 80 Keyboard 80 Mouse 81 Digitizing (Graphic) Tablet 82 Trackball 82 Joystick 83 Pick DEVICES 84 Light Pens 84 Touch Screens 84 Source data Entry DEVICES 85 Digital Camera 85 Scanner 86 Optical Mark Reader (OMR)

Input and output devices are similar in operation but perform opposite functions. It is through the use of these devices that the computer is able to communicate with the outside world. Input data for the computer system could be in any of the following forms : …

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  Data, Input, Output, Input and output, Input output, Input data

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