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Technical Roshan
2020-08-01

A Short Brief to Input and Output Unit

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  • A computer is an electronic device that accepts input, processes out the data according to a asset of instructions, stores it and gives some meaningful output.
  • A computer consists of an input unit, a central processing unit, an output unit and a secondary storage unit.
  • Any instruction or data given to the computer is called input.
  • An input device is used to enter data or information into the computer for processing.
  • A keyboard is the main input device use to input data and instruction into the computer.
  • A mouse is the most commonly used input and pointing device that lets you to select the items and move in the screen.
  • A light pen is a light sensitive pointing devices used to select or modify text or data on the screen.
  • A joystick is an input device used for playing games.

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  • A scanner is an input device that scans text, images and object optically.
  • A microphone is an input device used to record and store sound into a computer.
  • OCR(Optical Character Reader/Recognition) is used to read character from a printed paper into the computer.
  • OMR(Optical Mark Recognition) is a device for capturing the data formed by dark and light marks on the paper on specific positions.
  • MICR(Magnetic Ink Character Recognition)is mainly used by the banking industry to facilitate the processing of cheques. MICR codes can be easily read by humans.
  • A bar Code Reader is an input device used for reading bar codes present on the surface of the products. It is in the form of stripes of dark and light ink.
  • A digital camera can take photograph and video which can be used, viewed, and can be edited on a computer.

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  • A voice input device allows the user to control the computer using the voice command instead of the keyboard.
  • A output devices is used to display or print the processed data on the screen.
  • The two most common types of monitor are Cathode Ray Tube(CRT) and Liquid Crystal Display(LCD) or Thin Film Transistor(TFT).
  • A touch screen is a special monitor that allows the users to input information by touching the icon on the screen. 
  • A Printer is a peripheral device used for printing the output on a paper. The two types of printer are impact and Non-impact printers.
  • Speakers are the output devices which are used to play sound files.

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  • Plotter is an output device which is used to print graphics on a paper or polyester films.
  • Hard Disk, CD-ROM and DVD are the most common storage devices which are used to store large amount of data. A DVD can store more data than a CD.
  • A Blu-Ray Disk is a next generation optical disk format that enables crystal clear audio entertainment, as well as high definition video and stores large amount of data as compare to DVD and CD.
  • A flash drive is a small and portable memory storage device that are used to transfer and store information from one computer to another.
  • A Memory Sticks is a removable flash memory card format used as a storage media for portable devices like digital camera, mobile phones etc.

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