How a Computer Thinks

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How a Computer Thinks
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Bits and Bytes

• Like a light switch
• ON 1
• OFF 0
• Each 1 and 0 is called a bit or binary digit.

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Bits and Bytes (cont.)

• 8 Bits (1s and 0s) 1 Byte
• 01000001 A
• 01100001 a
• 01001010 J
• 01101010 j
• Every letter or number has its own code.

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Bits and Bytes (cont.)

• 1 kilobyte (kb) 1,000 bytes
• 1 megabyte (Mb) 1,000,000 bytes
• 1 gigabyte (Gb) 1,000,000,000 bytes

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Input Devices
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Keyboard

• Most common type of input device, all have three
  main parts
• Typewriter keys Function keys Numerical keys

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Mouse

• Used for pointing, clicking, double clicking,and
  dragging

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Trackball

• A stationary mouse

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Scanner

• Device that lets you input text or other images
  into a computer memory

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Bar Code Scanner

• Reads lines printed on a product that represents
  data. The lines are called the UPCUniversal
  Product Code

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Light Pens

• Used to point locations on a display screen

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Touch Display Screen

• The user physically touches the screen to select
  menu items or functions

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Speech Recognition

• By using a microphone plugged into the computer,
  you are able to record speech into the computer
  for playback

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Joy Stick

• Used to move cursor around the screen most
  frequently used with games

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