Sunday, May 27, 2012

Key Board and Mouse

  • The main input devices of a computer are the keyboard and the mouse.
  • The keyboard is used to type text and enter commands.
  • The present day keyboards have 101 or more keys.
  • The keyboard has an internal microprocessor that studies the state of every key on the keyboard and sends appropriate messages to the computer.
  • You can connect a keyboard to the computer through the DIN 5, PPS/2 keyboard port or the USB port.
  • Cordless keyboard that run on batteries provide ease of use.
  • The different type of keyboards are:
  1. 101-key enhanced keyboards
  2. 102-key enhanced keyboards
  3. 104-key windows keyboards
  4. Ergonomic keyboards 
  5. Programmable keyboards
  6. Cordless keyboards
  • You can clean your keyboard by removing one key at a time and cleaning underneath. 
  • Using blower is the easiest way to clean a keyboard, if there is no sticky substance underneath the keys.
  • You must not press keys on the keyboard when the system is starting up, this will cause the keyboard to register an error.
  • The mouse is a pointing device that is used to move the cursor or pointer on the screen.
  • You can connect the mouse to the computer through the serial port, PS/2 mouse point or the USB port.
  • A cordless mouse operates on batteries and communicates with the computer using a transceiver. 
  • The different types of mouse are:
  1. Mechanical mice
  2. Optomechanical mice
  3. Optical mice
  4. Cordless mice
  • When you are connecting a mouse or keyboard to the PS/2 port, you must be careful not to interchange the ports.
  • You must be careful not to spill things around a keyboard or mouse, to keep then trouble-free.
  • You can clean a mouse by removing the cover and cleaning the mouse ball and rollers.
  • A cordless mouse may stop functioning properly because of a low battery or dirt inside the mouse.

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