Input Devices

1
Input Devices

• Keyboard
• Pointing devices
• 1. Mouse and trackball
• 2. Joystick
• 3. Touch screen
• 4. Light pen
• 5. Digitizer pad
• Voice recognition devices

2
Input Devices(continued)

• Character Readers
• 1. MICR magnetic-ink character recognition
• 2. OMR optical mark readers
• 3. OCR optical character recognition
• Scanning devices - graphs and images
• Digital cameras

3
Output devices

• Monitors
• 1.Types
• CRT (cathode ray tube) - higher resolution
• LCD (liquid crystal display) - cheaper, portable
• 2. Characteristics
• Resolution - pixels per sq. inch
• Color Depth -16, 256, 32 K, 16 G colors
• Refresh Rate - measured in Hz (60-85 Hz)

4
Common Resolutions and Color Depths
5
Output devices(continued)

• Printers
• 1. Impact printers
• Character printers
• High speed line printers
• 2. Nonimpact printers
• Ink-jet
• Laser printers
• Plotters

6
Input and Output Devices

• Terminals
• 1. Point of sale
• 2. Interactive remote - dumb
• 3. Intelligent - clients PCs
• Voice response devices
• Vision systems
• 1. Image processing for creating and storing
  selected images
• 2. Pattern recognition of digitized images
• CAD/CAM systems