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    • Input devices.
      • Manual
        • Concept keyboard
          • Each button on a concept keyboard relates to a particular item or function
        • Trackball
          • Used as an alternative to a mouse
        • Joystick
          • Joysticks used to be popular with gamers
        • Digital camera
          • A digital camera takes pictures and can usually record video too.
        • Scanner
          • A scanner can be used to digitise images
      • Automatic
        • Sensors
          • Sensors are often used as part of a feedback cycle
        • Barcode reader
          • Barcodes are represented by black vertical bars and are read by a barcode reader
        • Magnetic ***** (or *****e) reader
          • Magnetic *****es are built into many plastic cards such as debit or credit cards and personal identity cards
        • Magnetic Ink Character Reader (MICR)
          • Magnetic ink characters appear at the bottom of cheques
        • Optical Mark Reader (OMR)
          • An OMR reads marks made by pencil on a printed form into the computer
    • CPU
      • The CPU (Central Processing Unit) is the part of a computer system that is commonly referred to as the "brains" of a computer.
      • The CPU is responsible for executing a sequence of stored instructions called a program.
      • CPU's aren’t only found in desktop or laptop computers, many electronic devices now rely on them for their operation
    • Output devices
      • Monitor
        • The most common output device is the monitor or VDU.
      • Printers
        • Laser printers are quite expensive to buy and run but produce a high quality output and are quiet and fast.
        • nk-jet printers offer black and white or colour printing with reduced levels of quality and speed. Colour ink jet printers are cheaper to buy than colour laser printers.
        • Dot matrix printers are not so common today
      • Plotters
        • A plotter can be used to produce high quality, accurate, A3 size or bigger drawings
      • Other output devices
        • speakersprojectorsbuzzersmotorsswitched outputslightsmechanical devices, eg a robot arm


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