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Computer Confluence 7/e. Chapter 3 Hardware Basics: Peripherals. © 2006 Prentice-Hall, Inc. Computer Confluence 7/e Chapter 3 Objectives. Input devices and their roles in getting different types of information into the computer Output devices and the ways they make computers more useful

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Computer confluence 7 e l.jpg

Computer Confluence 7/e

Chapter 3

Hardware Basics: Peripherals

© 2006 Prentice-Hall, Inc.


Computer confluence 7 e chapter 3 objectives l.jpg

Computer Confluence 7/eChapter 3Objectives

Input devices and their roles in getting different types of information into the computer

Output devices and the ways they make computers more useful

The functionality of different types of storage devices

The ways the components of a computer system fit together

© 2006 Prentice-Hall, Inc.


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Computer Confluence 7/eChapter 3Input: From Person to Processor

Keyboard

The most familiar input device

Used to enter letters, numbers and special characters

© 2006 Prentice-Hall, Inc.


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Computer Confluence 7/eChapter 3Input: From Person to Processor

Standard keyboard

Ergonomic keyboards

To address possible medical problems

Place the keys at an angels that are easier on your arms and hands.

Wireless keyboard

Folding keyboards

Used with palm-sizedcomputers

One-handed keyboards

Keyboards printed on membranes

that can be rolled or folded like paper.

© 2006 Prentice-Hall, Inc.


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this standard-size fabric keyboard rolls up into a lightweight, compact package that can be tucked into a pocket, or briefcase.


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Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

Pointing Devices

Mouse

Portable computers :

Touchpad (track pad)

Pointing stick

Trackball

Other pointing devices :

Joystick

Graphics tablet

stylus

Touch screen

© 2006 Prentice-Hall, Inc.


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Variants of the Mouse lightweight, compact package that can be tucked into a pocket, or briefcase.

  • Trackballs

    • Upside down mouse

    • Hand rests on the ball

    • User moves the ball

    • Uses little desk space


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Track pads lightweight, compact package that can be tucked into a pocket, or briefcase.

Stationary pointing device

Small plastic rectangle

Finger moves across the pad

Pointer moves with the pointer

Popular on laptops

Variants of the Mouse


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Variants of the Mouse lightweight, compact package that can be tucked into a pocket, or briefcase.

Track point

  • Little joystick on the keyboard

  • Move pointer by moving the joystick


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Pen based input lightweight, compact package that can be tucked into a pocket, or briefcase.

Tablet PCs, PDA

Pen used to write data

Pen used as a pointer

Handwriting recognition

Devices for the Hand


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Touch screens lightweight, compact package that can be tucked into a pocket, or briefcase.

Sensors determine where finger points

Usually presents a menu to users

ATM’s, Malls,

Devices for the hand


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Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

Reading Tools

Reads marks representing codes specifically designed

for computer input

© 2006 Prentice-Hall, Inc.


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Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

Optical-mark readers:

use reflected light to determine the location of pencil marks on standardized test answer sheets and similar forms.

© 2006 Prentice-Hall, Inc.


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Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

  • Magnetic-ink character readers : read those odd-shaped numbers printed with magnetic ink on the checks.

  • Bar-code readers

    use light to read universal product code (UPC). They are attached to point of sale terminals (POS). These terminals send the scanned information to a mainframe computer => item’s price, calculate total.

  • Radio Frequency Identification Readers :

    use radio waves to communicate with Radio Frequency Identification (RFID) tags. When energized by a nearby RFID reader, an RFID tag broadcasts its unique identification number to the reader. which digitizes the information for input into a computer.


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An RFID tag used for lightweight, compact package that can be tucked into a pocket, or briefcase.electronic toll collection

RFID tags used in libraries: square book tag, round CD/DVD tag and rectangular VHS tag.


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Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

Because test forms, magnetic ink character, bar codes, and RFID tags were designed to be read by computers, the devices that read them are extremely accurate.

Reading text from books, magazines, and other printed document is more challenging because of the great variety of printed text.

  • Optical character recognition (OCR) is the technology of recognizing individual characters on a printed page, so they can be stored and edited as text.


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Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

Before a computer can recognize handwriting or printed text, it must first create a digital image of the page that it can store in memory.=>scanner.

A scanner doesn’t actually read or recognize letters and numbers on a page- it just makes a digital “ picture” of the page available to the computer.


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  • Pen scanners : lightweight, compact package that can be tucked into a pocket, or briefcase.

    • looks like highlighters.

    • Wireless scanners that can perform character recognition.

  • pen-based computers such as the Tablet PC

    • can work without a keyboard

    • accept input from a stylus

    • handwritten recognition software to translate the user’s handwritten forms into ASCII characters.


  • Slide19 l.jpg

    • Personal digital assistants (PDAs): lightweight, compact package that can be tucked into a pocket, or briefcase.

      • are handheld pen computers that serve as organizers, notebooks, communication devices, ….

    • Smart whiteboard:

      • serve as an input device for a PC.

      • board is stored as a digital image on the computer’s disk.


    Digitizing devices l.jpg
    Digitizing devices lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Before a computer can recognize hand-written or printed text, a scanner or other input device must digitize the information- convert it into a digital form-.

    • A scanner is an input devicethat can create a digital representation of a printed image.


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    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

    Digitizing the Real World

    Scanners capture and digitize printed images

    Flatbed

    Slide scanner : scan only slides and negatives.

    Drum : larger and more expensive.

    Sheet-fed : small, portable, and inexpensive.

    © 2006 Prentice-Hall, Inc.


    Slide22 l.jpg

    Drum scanner lightweight, compact package that can be tucked into a pocket, or briefcase.

    Slide scanner

    Sheet fedscanner


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    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

    Digital camera

    Snapshots captured as digital images

    Digital images stored as bit patterns on disks or other digital storage media

    © 2006 Prentice-Hall, Inc.


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    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

    Video digitizer

    Capture input from a:

    Video camera

    Video cassette recorder or television

    Convert it to a digital signal

    Stored in memory and displayed on computer screens

    Digital video camera

    can send video signals directly into a computer without a video digitizer.

    Videoconferencing

    People in diverse locations can see and hear each other

    Used to conduct long-distance meetings

    Video images transmitted through networks

    © 2006 Prentice-Hall, Inc.


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    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

    Audio digitizers

    Digitize sounds from

    Microphones

    Other audio input devices

    Digital signals can be

    Stored

    Further processed with specialized software

    A digital signal processing chip compresses the stream of bits before it is transmitted to the CPU

    © 2006 Prentice-Hall, Inc.


    Audiovisual input devices l.jpg
    Audiovisual Input Devices lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Microphones

      • Used to record speech

      • Speech recognition

        • “Understands” human speech

        • Allows dictation or control of computer

        • Matches spoken sound to known phonemes

        • Enters best match into document


    Computer confluence 7 e chapter 3 input from person to processor27 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

    Speech recognition software

    Converts voice data into words that can be edited and printed

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 input from person to processor28 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Input: From Person to Processor

    Sensors

    Designed to monitor physical conditions

    Temperature, humidity, pressure

    Provide data used in:

    Robotics

    Environmental climate control

    Weather forecasting

    Medical monitoring

    Biofeedback

    Scientific research

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 output from pulses to people l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Output: From Pulses to People

    Screen Output

    A monitor or video display terminal (VDT) displays characters, graphics, photographic images, animation and video

    Video adapter —connects the monitor to the computer

    a circuit board installed in a slot inside the system unit

    VRAM or video memory —a special portion of RAM to hold video images

    the amount of VRAM determines the max. resolution and color depth.

    the more video memory, the more picture detail is displayed.

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 output from pulses to people30 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Output: From Pulses to People

    Monitor size: Measured as a diagonal line across the screen

    Resolution: The number of pixels displayed on the screen

    Pixels (or picture elements): tiny dots that compose a picture

    The higher the resolution, the closer together the dots and the clearer the image.

    Image quality is affected by resolution and color depth (or bit depth)

    Color depth refers to the number of different colors a monitor displays at one time

    © 2006 Prentice-Hall, Inc.


    Monitors l.jpg
    Monitors lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Categorized by color output

      • Monochrome

        • One color with black background

      • Grayscale

        • black, white, and Varying degrees of gray

      • Color

        • Display 4 to 16 million colors


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    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Output: From Pulses to People

    Monitor classes

    CRTs (cathode-ray tubes)

    LCDs (liquid crystal displays) are now more popular

    Overhead projection panels

    Video projectors

    Portable computers

    © 2006 Prentice-Hall, Inc.


    Monitors33 l.jpg
    Monitors lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Cathode Ray Tube (CRT)

      • Electrons fired from the back

      • Electrons excite phosphor to glow

      • Phosphor is arranged in dots called pixels

    • CRT drawbacks

      • Very large

      • Very heavy

      • Use a lot of electricity


    Flat panel monitors l.jpg
    Flat-panel Monitors lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Liquid Crystal Display (LCD)

      • Commonly found on laptops

      • Desktop versions exist

      • Solve the problems of CRT

      • Fluorescent lights provide illumination

    • Electro-luminescent displays (ELD)

      • Similar to LCD

      • Uses phosphor to produce light

    • Plasma monitor

      • Gas is excited to produce light


    Computer confluence 7 e chapter 3 output from pulses to people35 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Output: From Pulses to People

    Paper Output

    Printers produce paper output or hard copy

    Two basic groups of printers:

    Impact printers

    nonimpact printers

    © 2006 Prentice-Hall, Inc.


    Commonly used printers l.jpg
    Commonly Used Printers lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Impact printers

      • Line printers

      • Dot-matrix printers

    • Generate output by striking the paper, ribbon, and print hammer together.

    • Uses an inked ribbon

  • Non-impact printers

    • Use methods other than force

    • Tend to be quiet and fast


  • Commonly used printers37 l.jpg
    Commonly Used Printers lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Line printers

      - Impact printer

      - speedy but noisy

      - limited to printing characters.


    Commonly used printers38 l.jpg
    Commonly Used Printers lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Dot matrix printers

      • Impact printer

      • Used to print to multi-sheet pages

      • Print head strikes inked ribbon

      • Speed measured in characters per second


    Dot matrix print head l.jpg
    Dot Matrix Print Head lightweight, compact package that can be tucked into a pocket, or briefcase.


    Output from pulses to people l.jpg
    Output: From Pulses to People lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Non-impact printers

    • Laser printers

      • Laser beam reflected off a rotating drum to create patterns of electrical charges

      • Faster and more expensive than dot matrix printer

      • Produce High-resolution output

      • Color or black and white

      • Print process

        • Laser draws text on page

        • Toner sticks to text

        • Toner melted to page

      • Speed measured in pages per minute

      • Quality expressed as dots per inch


    Output from pulses to people41 l.jpg
    Output: From Pulses to People lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Non-impact printer

    • Inkjet printers

      • Sprays ink onto paper to produce printed text and graphic images

      • Prints fewer pages/minute than laser printer

      • High-quality color costing less than laser printer

      • Speed measured in pages per minute

      • Quality expressed as dots per inch


    Dots per inch l.jpg
    Dots Per Inch lightweight, compact package that can be tucked into a pocket, or briefcase.


    High quality printers l.jpg
    High-Quality Printers lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Photo printers

      • Produces film quality pictures

      • Prints very slow

      • Prints a variety of sizes


    Computer confluence 7 e chapter 3 output from pulses to people44 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Output: From Pulses to People

    Multifunction printer or MFP combines a scanner, printer and a fax modem

    Plotter: an automated drawing tool that can produce large, finely scaled engineering blueprints and maps

    © 2006 Prentice-Hall, Inc.


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    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Output: From Pulses to People

    Fax Machines and Fax Modems

    Facsimile (fax) machine

    Sending:

    fax machine scans each page as an image,

    converts the image into a series of electronic pulses,

    sends those signals over phone lines to another fax.

    Receiving:

    fax machine uses the signals to reconstruct the image and

    print black-and-white facsimiles or copies of the originals

    © 2006 Prentice-Hall, Inc.


    Fax machines and fax modems l.jpg
    Fax Machines and Fax Modems lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Fax modem:

      • directly from PC to fax machine via modem & phone line

      • translate the document into signals that can be sent over phone wires.

      • Decoded by the receiving fax machine. (remote printer)

      • receive transmission from fax machine (remote scanner)


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    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Output: From Pulses to People

    Output You Can Hear

    Sound card

    Enables the PC to:

    Accept microphone input

    Play music and other sound through speakers or headphones

    Process sound in a variety of ways

    Synthesizers

    Specialized circuitry used to produce music, noise electronically.

    © 2006 Prentice-Hall, Inc.


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    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Output: From Pulses to People

    Controlling Other Machines

    Output devices take bit patterns and turn them into non-digital movements

    Robot arms

    Telephone switchboards

    Transportation devices

    Automated factory equipment

    Spacecraft

    Force feedback joystick

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 output from pulses to people49 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Output: From Pulses to People

    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 to loosen tight muscles

    Listen to your body

    Seek help when you need it

    © 2006 Prentice-Hall, Inc.


    Describing storage devices l.jpg
    Describing Storage Devices lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Store data when computer is off

    • Two processes

      • Writing data

      • Reading data


    Describing storage devices51 l.jpg
    Describing Storage Devices lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Storage terms

      • Media is the material storing data

      • Storage devices manage the media

      • Magnetic devices use a magnet

      • Optical devices use lasers

      • Solid-state devices have physical switches


    Magnetic storage devices l.jpg
    Magnetic Storage Devices lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Most common form of storage

    • Hard drives, floppy drives, tape

    • All magnetic drives work the same


    Magnetic storage devices53 l.jpg
    Magnetic Storage Devices lightweight, compact package that can be tucked into a pocket, or briefcase.

    Floppy Disk

    Hard Disk

    Tape


    Computer confluence 7 e chapter 3 storage devices input meets output l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Storage Devices: Input Meets Output

    Magnetic Tape

    Can store large amounts of information in a small space at a relatively low cost

    Limitation: slow sequential data access : retrieve information by zipping through it in the order in which it was recorded.

    Used mainly for backup purposes

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 storage devices input meets output55 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Storage Devices: Input Meets Output

    Magnetic Disks

    Random data access

    information retrieval without regard to the order in which it was recorded.

    © 2006 Prentice-Hall, Inc.


    Magnetic storage devices56 l.jpg
    Magnetic Storage Devices lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Diskettes

      • Also known as floppy disks

      • Read with a disk drive

      • Provide inexpensive, portable storage

      • Slow speed.

      • limited capacity (3 ½ floppy disk holds 1.44 MB)


    Magnetic storage devices57 l.jpg
    Magnetic Storage Devices lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Hard disks

      • Primary storage device in a computer

      • Non-removable, rigid disks that spin continuously and rapidly

      • 2 or more aluminum platters

      • Each platter has 2 sides

      • Provide much faster access than a floppy disk

      • Data found in 9.5 ms or less

      • Drive capacity greater than 40 GB


    Illustrated hard disk l.jpg
    Illustrated Hard Disk lightweight, compact package that can be tucked into a pocket, or briefcase.


    Magnetic storage devices59 l.jpg
    Magnetic Storage Devices lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Removable high capacity disks

      • Speed of hard disk

      • Portability of floppy disk

      • Several variants have emerged

      • Ex. Zip disks

        • High capacity floppy disk

        • Stores up to 750 MB of data


    Computer confluence 7 e chapter 3 storage devices input meets output60 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Storage Devices: Input Meets Output

    Optical Disks

    Use laser beams to read and write bits of information on the disk surface

    Not as fast as magnetic hard disks

    Massive storage capacity

    Very reliable

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 storage devices input meets output61 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Storage Devices: Input Meets Output

    CD-ROM

    Optical drives that read CD-ROMs

    CD-R

    WORM media (write-once, read many)

    CD-RW

    Can read CD-ROMs and write, erase and

    rewrite data onto CD-R & CD-RW disks

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 storage devices input meets output62 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Storage Devices: Input Meets Output

    DVD (Digital Versatile Disks)

    Store & distribute all kinds of data

    Hold between 3.8 and 17 gigabytes of information

    DVD-ROM drives

    Can play DVD movies, read DVD data disks, read

    standard CD-ROMs, and play audio CDs

    Because they’re read-only, they can’t record data, music, or movies

    DVD-RAM drives

    Can read, erase, and write data (but not DVD video) on multi-gigabyte

    DVD-R (but not CD-R or CD-RW) media

    © 2006 Prentice-Hall, Inc.


    Solid state devices l.jpg
    Solid State Devices lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Data is stored physically

    • No magnets or laser

    • No moving parts

    • Very fast


    Computer confluence 7 e chapter 3 storage devices input meets output64 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Storage Devices: Input Meets Output

    Solid-State Storage Devices

    Flash memory is an erasable memory chip

    Sizes range from 16 MB to 1 GB

    Compact alternative to disk storage

    Contains no moving parts

    Designed for specific applications such as storing pictures in digital cameras

    Likely to replace disk and tape storage

    © 2006 Prentice-Hall, Inc.


    Storage devices input meets output l.jpg
    Storage Devices: Input Meets Output lightweight, compact package that can be tucked into a pocket, or briefcase.

    • USB flash drives

      • Can store up to hundreds of megabytes of data.

      • they plug into a computer’s USB port.


    Computer confluence 7 e chapter 3 computer systems the sum of its parts l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Computer Systems: The Sum of Its Parts

    Personal Computers: basic design classes

    Tower systems

    Tall, narrow boxes that generally have more expansion slots and bays than other designs

    Flat desktop systems

    Designed to sit under the monitor like a platform

    All-in-one systems (like the iMac)

    Combine monitor and system unit into a single housing

    © 2006 Prentice-Hall, Inc.


    Slide67 l.jpg
    iMac lightweight, compact package that can be tucked into a pocket, or briefcase.


    Computer confluence 7 e chapter 3 computer systems the sum of its parts68 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Computer Systems: The Sum of Its Parts

    Portable computers

    Include all the essential components, including keyboard and pointing device, in one compact box

    © 2006 Prentice-Hall, Inc.


    Extending the processors power l.jpg
    Extending The Processors Power lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Standard computer ports

      • Keyboard and mouse ports

      • USB ports

      • Parallel

      • Network

      • Modem

      • Audio

      • Serial

      • Video


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    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Computer Systems: The Sum of Its Parts

    Ports and Slots Revisited

    The system or motherboard includes several standard ports:

    Serial Port for attaching devices that send/receive messages one bit at a time (modems)

    Parallel Port for attaching devices that send/receive bits in groups (printers)

    Keyboard/Mouse Portfor attaching a keyboard and a mouse

    © 2006 Prentice-Hall, Inc.


    Extending the processors power71 l.jpg
    Extending The Processors Power lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Serial and parallel ports

      • Connect to printers or modems

      • Parallel ports move bits simultaneously

        • Made of 8 – 32 wires

        • Internal busses are parallel

      • Serial ports move one bit

        • Lower data flow than parallel

        • Requires control wires


    Serial communications l.jpg
    Serial Communications lightweight, compact package that can be tucked into a pocket, or briefcase.


    Parallel communications l.jpg
    Parallel Communications lightweight, compact package that can be tucked into a pocket, or briefcase.


    Computer confluence 7 e chapter 3 computer systems the sum of its parts74 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Computer Systems: The Sum of Its Parts

    Other ports are typically included on expansion boards rather than 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

    LAN port used faster connection to a local-area network (LAN)

    © 2006 Prentice-Hall, Inc.


    Extending the processors power75 l.jpg
    Extending The Processors Power lightweight, compact package that can be tucked into a pocket, or briefcase.

    • SCSI

      • Small Computer System Interface

      • Supports dozens of devices

      • External devices daisy chain

        • allows several peripherals to be strung together and attached to a single port

      • Fast hard drives and CD-ROMs


    Internal and external drives l.jpg
    Internal and external drives lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Disks drives generally reside in bays inside the system unit.

    • Some PC have extra bays for additional internal hard drives or removable media

    • External drives can be connected to the system through ports.

    • Some portable enable you to Hot swap devices : remove and replace them without powering down.


    Extending the processors power78 l.jpg
    Extending the Processors Power lightweight, compact package that can be tucked into a pocket, or briefcase.

    • Expansion slots and boards

      • Allows users to configure the machine

      • Slots allow the addition of new devices

      • Devices are stored on cards

      • Computer must be off before inserting


    Computer confluence 7 e chapter 3 computer systems the sum of its parts79 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Computer Systems: The Sum of Its Parts

    Expansion Made Easy

    With the PC open architecture -

    the design that enables you to add expansion cards and peripherals-

    and the introduction of new interfaces, you can hot swap devices.

    © 2006 Prentice-Hall, Inc.


    Extending the processors power80 l.jpg
    Extending The Processors Power lightweight, compact package that can be tucked into a pocket, or briefcase.

    • USB

      • Universal Serial Bus

      • Most popular external bus

      • Supports up to 127 devices

        • including keyboard, mice, digital cameras, scanners, and storage devices can be chained together from a single USB port.

      • Hot swappable

      • transmits a hundred times faster than a PC serial port


    Extending the processors power81 l.jpg
    Extending the Processors Power lightweight, compact package that can be tucked into a pocket, or briefcase.

    • FireWire

      • IEEE 1394

      • can move data between devices at 400 or more megabits per second

      • High speed makes it ideal for data-intensive work like digital video Cameras and video equipment

      • Hot swappable

      • Port is very expensive

    • FireWire 800

      • Recently introduced on high-end Macintosh systems

      • offers 800 Mbps transfer speeds


    Computer confluence 7 e chapter 3 computer systems the sum of its parts82 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Computer Systems: The Sum of Its Parts

    Putting It All Together

    A typical computer system might have several different input, output, and storage peripherals -- the key is compatibility

    Networks blur the boundaries between computers

    Networked computers may have access to all the peripherals on a system

    The computer is, in effect, just a tiny part of a global system of interconnected networks

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 inventing the future tomorrow s peripherals l.jpg

    You can count how many seeds are in the apple, lightweight, compact package that can be tucked into a pocket, or briefcase.

    but not how many apples are in the seed.

    —Ken Kesey, author ofOne Flew over the Cuckoo’s Nest

    Computer Confluence 7/eChapter 3Inventing the Future: Tomorrow’s Peripherals

    Tomorrow’s Storage

    Smaller disks that hold more

    a single-electron memory chip the size of a thumbnail that can store all the sounds and images of a full-length feature film

    Tomorrow’s Output

    Flat-panel screens are replacing desktop CRTs at an ever-increasing rate

    Retinal display that works without a screen

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 inventing the future tomorrow s peripherals84 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Inventing the Future: Tomorrow’s Peripherals

    Tomorrow’s Input: Sensors

    More sophisticated devices will serve as eyes, ears, and other types of sense organs for computer networks

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 lesson summary l.jpg

    A computer terminal is lightweight, compact package that can be tucked into a pocket, or briefcase.not some clunky old television with a typewriter in front of it. It is an interface where the mind and body can connect with the universe and move bits of it about.

    —Douglas Adams, author of The Hitchhiker’s Guide to the Galaxy

    Computer Confluence 7/eChapter 3Lesson Summary

    Peripherals allow computer to communicate with the outside world and store information for later useinformation

    The most common input devices today are the keyboard and the mouse

    A variety of other input devices can be connected to the computer

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 lesson summary86 l.jpg

    Computer Confluence 7/e lightweight, compact package that can be tucked into a pocket, or briefcase.Chapter 3Lesson Summary

    Output devices perform the opposite function: They accept strings of bits from the computer and transform them into a form that is useful or meaningful outside the computer

    Storage devices are capable of two-way communication with the computer: Because of their high-speed random access capability are the most common forms of storage on modern computers

    © 2006 Prentice-Hall, Inc.


    Computer confluence 7 e chapter 3 lesson summary87 l.jpg

    As a rule, men lightweight, compact package that can be tucked into a pocket, or briefcase.worrymore about what they can’t see than about what they can.

    —Julius Caesar

    Computer Confluence 7/eChapter 3Lesson Summary

    Network connections make it possible for computers to communicate with one another directly

    © 2006 Prentice-Hall, Inc.


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