Information Input and Output

INPUT DEVICES

• Input devices translate our
  data and communications into
  a form that the computer can
  understand
• The computer processes the
  data
• Output devices translate the
  data back into a form we can
  understand

THE KEYBOARD
Two types of keyboards
- Alphanumeric

• Typical keyboard has 101 keys
• 12 function keys
• Special-function keys
• Cursor-control key

- Special Function

• Designed for specific application
• Example: cash register

POINT-AND-DRAW DEVICES

• GUI lets you point and click
• With a mouse you can draw,
  drag and drop, click, and
  double-click
• A mouse can have one or two
  buttons, and some have a
  wheel for scrolling

SCANNERS

• Scanners read and
  interpret information on
  printed matter
• The information is
  converted to a format for
  storage

OCR AND BAR CODE SCANNERS

• Optical character
  recognition (OCR)
  Reads coded information
  and text
  Types
  - Contact and Laser
  - Handheld
  - Label
  Document