Computer Systems - Input And Output Devices

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					  Computer Systems –
Input and Output Devices




                  Academic
                 PowerPoint
                              1
      What is a Computer System?
• Every computer system consists of some
  –   input,
  –   processing, Input / Output      Processing       Memory

  –   memory/storage and
  –   output
                                   Secondary Storage




                                                          2
                     Input
   Input can be from a wide range of devices:
• Keyboard              • Joystick
• Mouse                 • Touch sensitive
• Optical readers         screen
  – Bar code, OCR       • Light pen
• Magnetic readers      • Digitisers
                        • Remote Data
                          Collection
                                                3
           Pointing Devices
• Mouse
  – used with a graphical user interface
    (GUI)
  – may have a roller ball or infrared

• Trackball
  – similar to a mouse except the ball is on top.
  – Used on laptop computers

                                                    4
           Pointing Devices
• Joysticks
  – used mainly for games
    where it is operated to
    move the cursor or
    other screen objects
  – also used for
    CAD/CAM systems


                              5
     Touch Sensitive Devices
• Touch sensitive screens
  – Used in CAD, multimedia information
    kiosks, games
• As an alternative to a mouse (touch pad)




                                             6
         Magnetic Devices
• Credit card readers
• MICR (Magnetic Ink Character
  Recognition)
  – cheque processing
             Pen Devices
• Hand writing recognition
• Games, demonstration (light pen)

                                     7
               Optical Devices
•   Barcode readers
•   Optical mark readers (objective tests, lotto)
•   Optical character readers (postcodes)
•   Scanners




                                                8
     Graphical Input Devices
• Digitiser
  – create drawings or trace existing drawings
• Graphics tablet
  – similar to a digitiser but has more options
    for the user




                                                  9
            Multimedia
• Sound
  – voice
• Video
• Digital camera




                         10
     Remote Data Collection
• Located away from processor
• Automate regular readings of
  natural phenomena
   – temperature, pressure, water
     velocity, seismic activity




                                    11
           Output Devices
• Printers
• Display
• Other - audio visual, microfilm




                                    12
                   Printers
• Impact                    • Non - impact
  – printing mechanism        –   Ink-Jet (bubble jet)
    strikes paper, ribbon     –   Laser
    and character             –   Thermal
    together
                              –   Label printers
  – e.g Dot matrix, band
    printers




                                                         13
           Display Devices
• Monitor / VDU / VDT
  – colour
  – monochrome
  – flat panel (not CRT)
     • LCD (active matrix or
       passive matrix)
     • Gas plasma



                               14
                      Other
• Data Projectors, projection
  panels
• Plotters
  – for plans, charts etc
• Computer Output
  Microfilm (COM)
  – records output on film
• Audio
  – voice, speakers
                                15
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posted:3/11/2012
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