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Peripherals. 3. Hardware Basics:. Chapter Outline. “We swim in a sea of information.” Gary Snyder. Input: From Person to Processor Output: From Pulses to People Storage Devices: Input meets Output Computer Systems: The Sum of Its Parts. The Omnipresent Keyboard.

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Presentation Transcript
chapter outline
Chapter Outline

“We swim in a sea of information.”

Gary Snyder

  • Input: From Person to Processor
  • Output: From Pulses to People
  • Storage Devices: Input meets Output
  • Computer Systems: The Sum of Its Parts

 2001 Prentice Hall

the omnipresent keyboard
The Omnipresent Keyboard

Keyboards are used to input and manipulate information with keys such as Letters and Numbers…

 2001 Prentice Hall

the omnipresent keyboard1
The Omnipresent Keyboard

…and Cursor Keys that allow you to move around the screen

…Function Keys that send special commands…

 2001 Prentice Hall

reading tools
Reading Tools
  • Optical-mark readers
  • Bar-code readers
  • Magnetic-ink character readers
  • Wand readers
  • Pen scanners

 2001 Prentice Hall

digitizing the real world
Digitizing the Real World

Audio digitizing and

Speech recognition software

Sensing devices

Video digitizing


 2001 Prentice Hall


Scanners capture and digitize images from external paper sources

 2001 Prentice Hall

video digitizers
Video Digitizers

Video digitizers contain circuitry to digitize frames from camcorders and other video sources.

 2001 Prentice Hall

digital cameras
Digital Cameras

Digital cameras turn real-world scenes into digital images that can be stored and manipulated by the computer

The images, stored in memory, can be transferred to a computer for either editing or storage

 2001 Prentice Hall

audio digitizers
Audio Digitizers
  • Audio digitizers contain circuitry to digitize sounds from microphones and other audio devices.
  • Spoken words, music, and

sound effects can be captured.

 2001 Prentice Hall

output from pulses to people


Video Monitor



Other Machines

Output: From Pulses to People

 2001 Prentice Hall

screen output
Video Monitor

Also called Video Display Terminal (VDT)

Image exists in video memory—VRAM

Monitor size is measured diagonally across the screen

Screen Output

 2001 Prentice Hall

  • Images are made up ofdots called pixelsforpicture elements
  • The number of pixelsaffects the resolutionof the monitor
  • The higher the resolution,the better the image quality

 2001 Prentice Hall

color depth pixel depth
Color Depth (Pixel Depth)
  • The amount of information per pixel is known as the color depth
    • Monochrome (1 bit of information per pixel)
    • Gray-scale (8 bits of information per pixel)
    • Color (8 or 16 bits of information per pixel)
    • True color (24 or 32 bits of information per pixel)

 2001 Prentice Hall

examples of color depth

4-bit depth

1-bit depth

8-bit depth

16-bit depth

Examples of Color Depth

 2001 Prentice Hall

classes of monitors
Classes of Monitors

CRT (cathode ray tube)

LCD (liquid crystal display)

 2001 Prentice Hall

crt cathode ray tube
CRT (Cathode Ray Tube)

A CRT is a television-style monitorfeaturing:

  • Clear image
  • Quick response time
  • Low cost

 2001 Prentice Hall

lcd liquid crystal display
LCD (Liquid Crystal Display)
  • LCDs are flat-panel monitors
  • Features include:
    • Lighter weight
    • More compact
  • More expensive
  • Dominate the portable computer market

 2001 Prentice Hall

paper output
Paper Output
  • Paper output is sometimes called hard copy
  • Hard copy can come from one of two kinds of printers:
    • Impact printers
    • Nonimpact printers

 2001 Prentice Hall

impact printers
Impact Printers
  • Line printers
    • Used by mainframes formassive jobs
    • Limited characters available
  • Dot-matrix printers
    • Image formed from dots printed on paper
    • Good for text and graphics
    • Inexpensive

 2001 Prentice Hall

nonimpact printers
Nonimpact Printers
  • Laser printers
    • Image transferred to paper with laser beam
    • Faster and more expensivethan dot-matrix
    • High-resolution hard copy

 2001 Prentice Hall

other nonimpact printers
Other Nonimpact Printers
  • Ink-jet
    • Dots of ink are sprayed onto the paper to form the image
    • High-resolution hard copy
    • Some models print can print colorphotographs

 2001 Prentice Hall

rules of thumb ergonomics and health
Rules of Thumb:Ergonomics and Health
  • Choose equipment that’s ergonomically designed
  • Create a healthy workspace
  • Build flexibility into your work environment
  • Rest your eyes
  • Stretch tight muscles

 2001 Prentice Hall

output you can hear
Output You Can Hear
  • Synthesizers can beused to generate music and sounds
  • Many computershave synthesizers
  • Sound cards havebuilt-in synthesizers

 2001 Prentice Hall

controlling other machines
Controlling Other Machines
  • Output devices turn bit patterns into non-digital movements
  • Robot arms
  • Telephone switchboards
  • Transportation devices
  • Automated factory equipment
  • Spacecraft

 2001 Prentice Hall

storage devices input meets output
Storage Devices:Input Meets Output
  • Peripherals with both input and output functions provide semi-permanent storage for data
  • Examples include:
    • Magnetic tape and disks
    • Zip, Jaz and SuperDisks
    • Magneto-optical disks

 2001 Prentice Hall

optical disks
Optical Disks
  • Optical disks use laser beams rather than magnets to read and write information
  • CD-ROM drives are optical drives that read CD-ROMs
  • CD-RW drives can write, erase, and rewrite CDs
  • DVD’s can hold between 3.8 and 17 gigabytes of data, they are replacing CD-ROMs

 2001 Prentice Hall

  • Flash memory
    • Compact alternative
    • No moving parts
    • May eventually replace disk and tape storage

 2001 Prentice Hall

ports and slots again
Ports and Slots…again
  • The system board (motherboard) includes several ports:
    • Serial Portfor attaching devices that send/receive messages one bit at a time (modems)
    • Parallel Portfor attaching devices that send/receive bits in groups (printers)
    • Keyboard/Mouse Port

 2001 Prentice Hall

ports and slots again1
Ports and Slots…again
  • Other ports that are generally included on expansion boards instead of the system board:
    • Video Port used to plug in a color monitor into the video board
    • Microphone, speaker, headphone, MIDI ports used to attach sound equipment
    • SCSI port allows several peripherals to be strung together and attached to a single port

 2001 Prentice Hall

internal and external drives
Internal and External Drives
  • Hard drive
  • CD or DVD
  • Floppy disk
  • Zip Drive
  • SCSI port

 2001 Prentice Hall

expansion made easy
Expansion Made Easy
  • USB and Firewire ports allow multiple devices to be connected to the same port and to be hot swapped:
    • USB (Universal Serial Bus) transmits a hundred times faster than a PC serial port
    • Firewire (IEEE 1394) can move data between devices at 400 or more megabits per second

 2001 Prentice Hall

putting it all together networks
Putting It All Together:Networks
  • Networks blur the boundaries between computers
    • Networks can include hundreds of different computers
    • Can span the globe by using satellites and fiber optic cables

 2001 Prentice Hall