devices by suchenfz

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									       Presentation
of Input & Output Devices




                   Prepared by
             Bernard, Angela & Vivian
     Input & Output Devices
 Tools for people to interact & communicate
  with computers.
 Enter data using input devices
 Computer give us back the results through
  output devices



                                               5-2
            Input Devices




   Any hardware component that allows the
    user to enter data, programs, commands,
    and user response to a computer


                                              5-3
Traditional Input Devices
Keyboards    Point-and-Draw Devices




                                 5-4
    Keyboards – the most
  commonly used input device



• Keys for letters of
alphabet, numbers
• 12 Function keys
• Arrow Keys
• Additional keys
• Status lights                5-5
Point-and-Draw Devices – allow the
user to control the pointer on the
screen




Mouse – 2/3 buttons & a ball underneath
•Ball underneath detects movements 
•Send signals to computer 
•Instructor the mouse pointer on the screen
 to move accordingly
                                              5-6
    Point-and-Draw Devices
Trackball                     Joystick

               Digitizer
             Tablet and Pen


Trackpoint                    Trackpad



                                         5-7
Scanners and Reading Devices
Capture data directly from the source
 document
 The input process becomes more
 efficient because manual data entry is
 eliminated




                                          5-8
           Optical Scanners
A light sensing input device
Reads printed text & graphics
Results are stored in rows & columns of dots
 called a BITMAP
Files containing the scanned object can be
 printed, sent via e-mail



                                                5-9
     3 Basic Scanner Categories
                   (OCR and Bar codes)


  Handheld label      Stationary label
                                       Document scanners
    scanners              scanners




 Wand scanners      Common in        Can scan
 Can use contact grocery stores      documents of
or laser technology  Use laser       various sizes
                    technology only                   5-10
      Data Collection Devices -
          Digital Cameras




quality is measured by resolution
                                    5-11
Audio & Video Input
        Audio input
         – Recording music, speech,
           or sound effects
         – Speech recognition
        Video input
         – Entering full-motion
           recording into a computer
           & storing the video on a
           hard disk or other medium
                                  5-12
         What is Output ?


 Data that has been processed into a
 useful form called information
 Text, graphic, audio, video




                                        5-13
  Output Devices - any component
capable of conveying information to a
                user




              Monitors
               Printers
        Multimedia Projectors
      Voice - Response Systems
                                        5-14
    Display Devices – visually displays
     soft copies of text, graphics, and
             video information

Color monitor: displays
 text, graphics and video
 information in color
 Monochrome monitor:
 display text, graphics and
 video information in one
 color

                                          5-15
                Printers




•Produce hard copies (printouts) of text,
graphics…
•Print with portrait or landscape
•Impact Printers or Nonimpact Printers      5-16
           Impact Printers
 Form characters & graphics by striking a
  mechanism against an ink ribbon that
  contacts the paper
 Withstand dusty environments, vibrations,
  & extreme temp.
 E.g. dot-matrix printers



                                              5-17
Dot Matrix Printers

      • It creates dots that form
      characters & graphics
      when tiny pins strike an
      inked ribbon
      • 50 to 700 characters/sec
      (cps)

                                 5-18
            Nonimpact Printers
   No striking mechanism
   Quiet
   High-Quality output
   Colour
   Single Sheets
   E.g. Ink-jet printers, laser printers, thermal printers,
    portable printers, label printers



                                                           5-19
Laser Printers/Page Printers
              High speed, high
               quality
              600 dpi to 1200 dpi
              Have memory, store
               entire page before
               printing  sometimes
               are called page printers

                                     5-20
               Ink-jet Printers
 600 dpi and up
 Inexpensive for color
  abilities
 Forms characters &
  graphics by spraying
  tiny drops of liquid ink
  onto a piece of paper

                                  5-21
Portable Printers

      • A small, lightweight printer
      • Allows a mobile user to
      print from a laptop or
      handheld computer



                                 5-22
Thermal Printers

       • Inexpensive;
       • Low printing quality,
       images fade over time
       • Produce high-quality
       drawings such as
       blueprints, maps,etc.

                                 5-23
        Other Output Devices
   Presentation Graphics
    – LCD Panels
    – LCD Projectors
   Voice-Response Systems
    – Speakers
    – Headsets
   Fax Machine

                               5-24
                 Terminals
function as both input & output devices
Consist of:
  – A monitor (output)
  – A keyboard (input)
  – A video card




                                           5-25
                  Terminals
Basic categories of terminals:
Dumb terminals
  – No independent processing power
  – Are used to enter & transmit data to, or receive &
    display information from the host computer
Intelligent terminals
  – Has memory & processor
  – Independent processing capability

                                                     5-26
Point-of-sale (POS) terminal:
  – Are used to record purchases at the point where
    consumer purchases the product/service
  – Used in grocery store, e.g. electronic cash
    register, bar code reader
Automatic teller machine (ATM):
  – A self-service banking machine attached to a
    host computer through a telephone network.
  – Touch screens, e.g. withdraw cash, deposit
    money, transfer funds, inquire A/C balance



                                                      5-27
End of Presentation
    Thank You

                      5-28

								
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