Input and Output Devices Unit 2

Input and Output Devices Unit 2

1. Input Devices

   • Keyboards
     • Uses
       • Input of data into apps
       • Typing in commands to the computer
     • Advantages
       • Fast entry of new text
       • Easy to use for most people
       • Easier to do verification checks as the data is entered
     • Disadvantages
       • Can be difficult if the user has an arm limitation
       • Slow method
       • Fairly large device that uses up valuable desk space
   • Numeric keypads
     • Uses
       • ATM's
       • Number entering
       • PIN
     • Advantages
       • Faster for number data entry
       • Easy to carry arouns
     • Disadvantages
       • Small keys makes input difficult
       • The order is not intuitive
   • Mouse
     • Uses
       • Control sotware
     • Advantages
       • Faster than a keyboard
       • Doesn't need a large space to work
     • Disadvantages
       • Difficult to use for people with an arm limitation
       • Easy to damage
     • Touchpad
       • Advantages
         • No need of a separated mouse
       • Disadvantages
         • Difficult to use rather than a mouse
   • Trackerball
     • Uses
       • Used when the user has a disability
       • Used in luxury cars for controlling the radio, music or telephones
     • Disadvantages
       • Expensier than mice
       • Need training
     • Advantages
       • Easier to controi
       • More accurate tan a mouse
       • Need less space tan a mouse
   • Remote control
     • Uses
       • TV, DVD, Satellite and Hi-Fi systems
     • Advantages
       • Can be operated from a reasonable distance
       • Danger involving processes can be conrolled from a distance