1. CHAPTER 2 CONT.

2. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Alternative input devices include:
Scanners
Magnetic stripe card reader
Bar code reader
Optical mark reader (OMR)
Digital cameras and digital video cameras
Webcams
Microphones for speech or voice recognition
Radio frequency identification (RFID reader)
Magnetic-ink character recognition (MICR reader)
Biometric input device
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3. Scanning Devices: convert scanned data into a form the system unit can process
Magnetic Stripe Card Reader: reads information stored on magnetic strips that are usually located on the back of credit cards or gift cards
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4. Barcode Reader: used to read an item’s universal product code
Barcode Reader: used to read an item’s universal product code For example, Fedex uses a barcode system to identify and track packages
Optical mark reader (OMR): : special scanning device which scans your grid-like Scantron test form and senses the magnetized marks from your pencil. Used to check optic sheets
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5. Webcam: camera attached to the computer, can be used to hold live chat
Digital Camera: Capture images digitally and store in memory.can also input images into your system directly  
Webcam: camera attached to the computer,
can be used to hold live chat
sessions and make video
phone calls
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6. Biometric Input Device: uses physical or chemical features of an individual’s body to provide a unique method of identification. Example: retina scanner, fingerprint reader, facial scanner
Radio Frequency Identification Reader: used for the purposes of automatically identifying and tracking tags (chips) attached to objects. Tags contain electronically stored information. To read passports, tracking pets
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7. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Output devices
Enable users to see, hear, or feel the end result of processing operations
The two most popular output devices
Monitors (also called displays)
Printers
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8. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Monitors
Known as screens or display screens and present visual images of text and graphic
Display a temporary copy (soft copy) of processed data
Types of monitors include:
Cathode-ray tube (CRT, legacy technology),
Liquid crystal display (LCD, older monitors),
Light Emitting Diode (LED, more advanced backlighting)
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9. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Monitors (con’t.)
LCD (flat-panel) displays:
Have a thin profile
Are used with newer desktops and notebooks
Have largely replaced CRT monitors
May accommodate high-definition video
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10. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Monitors (con’t.)
Size is diagonal measurement
Size is straightforward for LCDs but more complex for CRTs.
Quoted size—the size of the screen
Viewable area—the area unobstructed by the housing
Both must be disclosed by the manufacturer.
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11. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Resolution
Refers to the sharpness of an image
Number of pixels (picture elements) controls the resolution
Video Graphics Array (VGA)—lowest resolution standard (640 × 480)
Extended Graphics Array (XGA)—most used by computers today (1024 × 768)
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12. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers
Supply a hard copy of output displayed on a computer’s monitor
Types include:
Inkjet
Laser
Dot-matrix
Thermal-transfer (sometimes called dye sublimation printers)
Photo
Plotters
3D Printers
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13. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers (con’t.)
Inkjet —popular with home users
Provide excellent images—made up of small dots
Advantages:
Inexpensive
Generate professional color output
Disadvantages:
Relatively slow
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14. INK-JET PRINTER
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15. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers (con’t.)
Laser
Use electrostatic reproductive technology to produce high-quality output
Advantages:
High-resolution
Print faster than inkjet printers
Black-and-white printing costs less per page than inkjet printing
Disadvantages
Color laser printers more expensive
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16. LASER-JET PRINTER
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17. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers (con’t.)
Dot-matrix (impact)
Older, less popular
Used mostly for printing multipart forms and backup copies
Advantages
Able to print 3,000 lines per minute
Disadvantages
Poor print quality
Noisy
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18. DOT-MATRIX PRINTER
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19. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers (con’t.)
Thermal-transfer printers
Use a heat process to transfer an impression onto paper
Useful for issuing tickets or receipts
Advantages
High-quality images
Popular for mobile printing
Disadvantages
High-quality thermal printers are expensive
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20. THERMAL PRINTER
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21. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers (con’t.)
Photo
Uses special ink and paper
Often are inkjet printers
Prints directly from a digital camera or memory card
Plotters
Produce images through moving ink pens
Used for making oversized prints (i.e., maps, charts, blueprints)
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22. Used to make three dimensional solid objects from a digital file
3D Printers
Used to make three dimensional solid objects from a digital file
You can create virtual design of the object in 3D modeling programs
Create 3-D shapes adds a thin layer of material repeatedly until the item
is created
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23. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Other output devices include:
Speakers
Headphones
LCD projectors
DLP (digital light-processing) projectors
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24. Combination Input and Output Devices
Headsets
Combine a microphone and headphones
Multifunctional devices (MFD)
Also called all-in-one printers
Cost efficient but lower quality
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25. *
Summary
07/16/96
Explain the various types of keyboards and the purpose of the special keys on the keyboard, identify the commonly used pointing devices, and list alternative input devices.
List the types of monitors and the characteristics that determine a monitor’s quality.
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26. *
Summary
07/16/96
Identify the two major types of printers and indicate the advantages and disadvantages of each.
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27. Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall
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Copyright © 2012 Pearson Education, Inc.  
Publishing as Prentice Hall
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall