Peripheral Devices

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Chapter 2

• Peripheral Devices

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Whats inside and on the CD?

• This chapter provides an overview on
• Keyboard and mouse
• Specialized input devices
• Trackpads
• Digital cameras
• Joysticks
• Display devices and printers
• Voice synthesizers and plotters
• Technologies that provide easiest connections
• Component purchasing
• Tips to help when shopping for a computer,
  software, and peripheral devices

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What is a peripheral device?

• A peripheral device is any input or output
  component that connects to a computer
• Standard components include
• Keyboard
• Mouse
• Display unit
• Printer

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What is a peripheral device?

• Specialized peripheral devices include
• Playing games
• Monitoring home security
• Capturing video images
• Specialized peripheral devices are key components
  of large-scale computers
• High-speed printers for mass mailings
• High-speed optical character readers in banks
• Computer-controlled robots for
• Arc welding
• Circuit board assembly
• Painting

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What is a peripheral device?

• Handheld scanning devices keep track of package
  deliveries
• UPC scanners in check-out lanes

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What are the options for standard input devices?

• The keyboard is the most important input device
  on desktop and notebook computers
• Design of keyboard is based on typewriters
  QWERTY layout
• Additional keypad for editing
• Function keys for computer-specific tasks
• Numeric keypad

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What are the options for standard input devices?
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What are the options for standard input devices?

• Pointing devices manipulate on-screen pointer
• Mice
• Trackballs
• Pointing sticks
• Trackpads
• Joysticks

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What are the options for standard input devices?
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What are the options for specialized PC input
devices?

• A joystick looks like cars stick shift
• Controls objects on screen
• Can be adapted for physical challenges that make
  it difficult to use keyboard
• A digital camera used to capture still images
• Easily transferred to computer
• Produce images that can be stored, manipulated,
  posted on the Web, and transmitted as email
  attachments

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What are the options for specialized PC input
devices?

• A digital video camera captures moving images
• Easily transferred to computer
• Easily edited on computer
• A graphics tablet features pressure-sensitive
  surface and pen for free-hand drawing
• A digitizing tablet provides flat surface for
  vector drawing such as blueprints and technical
  drawings

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What are the options for specialized PC input
devices?

• A touch-sensitive screen can detect the location
  of a fingertip or stylus within the screen area
• A scanner converts images into bitmap graphics
  that can be viewed and edited with graphic
  software
• Can capture old photographs
• Scanned Text can be manipulated if scanner has
  optical character recognition

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What are the options for specialized PC input
devices?

• Standard microphone is used to collect audio
  input and is part of sound card
• Some software has speech recognition to allow for
  voice commands instead of keyboard and mouse
• Handy for narrations on Web sites and videos
• Require lots of storage space

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What are the most popular display technologies?

• LCD display produces image by manipulating light
  within layer of liquid crystal cells
• CRT display device, such as glass tube on
  standard TV
• Plasma screen creates image by illuminating
  miniature colored fluorescent lights in
  panel-like screen

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What are the most popular display technologies?

• Performance of display device is factor of
• Screen size
• Dot pitch
• Response time
• Color depth
• Contrast ratio
• Screen resolution

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What are the most popular printer technologies?

• Todays printers typically use ink jet or laser
  technology
• An ink jet printer has nozzle-like print head
  that sprays ink to form characters and graphics
• Inexpensive choice of most home and small
  business applications
• Print high quality images produced by digital
  cameras and scanners
• A laser printer uses same technology as
  photocopier
• More expensive
• Choice for business printers that produce high
  volumes

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What are the most popular printer technologies?

• When selecting printer consider
• Print resolution
• Print speed
• Duty cycle
• Operating costs
• Memory
• Duplex printing
• Networkability

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What are the options for specialized output
devices?

• Upgrade computers speaker system for better
  sound quality
• A plotter is a special printer for line drawing
  such as blueprints
• A voice synthesizer converts digital text into
  audio output
• A computer projection device displays
  computer-generated images on large screen

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How do I connect peripheral devices to my
computer?

• Installation is a pathway to transmit data
  between device and computer
• Wired connection may require only connecting wire
  to computer or may require adding expansion card
  to system unit
• Most computers include a variety of built-in
  ports for connecting devices
• Today, USB (universal serial bus) is the
  preferred way to connect devices
• Wireless connection typically requires
  transceiver on both devices
• Infrared light
• Bluetooth
• Wi-Fi

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How do I connect peripheral devices to my
computer?
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How do I connect peripheral devices to my
computer?

• If peripheral device requires a port not on your
  computer, you install an expansion card
• Some devices require software, called device
  driver, to set up communications

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How do I select components for my computer system?

• Guidelines for purchasing peripheral devices
• Consider the tasks for which youll use the
  computer
• Determine your budget
• Select a computer platform
• Choose a desktop, notebook, or tablet
  configuration
• Select processor type and speed
• Select an operating system

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How do I select components for my computer system?

• Consider your storage needs
• Consider RAM and video memory capacity
• Evaluate the computers upgradeability
• Select software
• Select peripheral devices and accessories
• Evaluate manufacturer and vendor support and
  warranty

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