Input, Output, and Storage

What Kinds of Peripheral Devices Would Suit Your

Needs?

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What Peripheral Devices Suit Your Needs?

Input DevicesInput Devices Output DevicesOutput Devices Storage DevicesStorage Devices

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5.1 Input Devices

• Input device captures information and translates it into a form that can be processed and used by other parts of your computer.

•Keyboards•Pointing devices•Game controllers•Scanners•Styluses•Microphones•Digital cameras•Web cams

p. 5.130 Fig. 5-1

SimNet Concepts Support CD: “Overview of Input Devices” and “Other Everyday Input Devices”

©2003 The McGraw-Hill Companies

Input Devices

• The keyboard is the most common input device. Types of keyboards include:• Wireless

• Multimedia and one-touch access

• Portable keyboards for PDAs

p. 5.131 Fig. 5-2

                     

          

                     

          

SimNet Concepts Support CD: “Keyboards”

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Types of Input Devices

p. 5.131 Fig. 5-2

                     

          

                     

          

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Pointing Devices

• Pointing devices are mainly used to choose and enter commands

• Pointing devices tend to have PS/2 connectors or USB connectors

• PS/2 connector fits into a PS/2 port, which a small round socket with small holes that fit the pins on the connector

• USB connectors fit into USB ports, and these are small rectangular openings on the back or front of your computer, or even on your keyboard or monitor

p. 5.131 Fig. 5-2

SimNet Concepts Support CD: “Ports and Cables”

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Pointing Devices

• Various pointing devices are available

• Types of pointing devices:

• Mouse

•Mechanical mouse

•Optical mouse

•Wireless mouse

• Trackball

• Touchpad

• Pointing stick

p. 5.132 & P. 5.133 Fig. 5-3 & Fig 5.4

SimNet Concepts Support CD: “Mice”

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Game Controller

• Game controllers are used mainly to play games

• Types of gaming devices• Gamepads

• Joysticks

• Gaming wheels

• Force feed

p. 5.134 Fig. 5-5

                     

          

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Specialized Input Devices

• Other types of input devices include:• Scanners

• Styluses

• Microphones

• Digital cameras

• Web cams

p. 5.135 Fig. 5-6

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Scanner

•Scanner is a light sensitive device that helps you copy or capture images, photos, and artwork that exist on paper. Types of scanners include:•Flatbed

                                                                   

SimNet Concepts Support CD: “Scanners”

©2003 The McGraw-Hill Companies

Styluses

• Stylus is an input device consisting of a thin stick that uses pressure to enter information or to click and point

• Styluses are used with:•PDAs •Tablet PCs•Graphics tablets

p. 5.135 Fig. 5-6

                                                                   

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Microphones

• Microphones are used to input audio

• Three main types of microphones are:•Desktop microphones•Headsets•Directional microphones

• Speech recognition is increasingly being included in application software

                     

          

                                                                   

                     

          

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Digital Cameras

• Digital cameras are used to: • Download images to a computer• Post pictures to the Web• Produce videos

• Resolution is measured in megapixels• Higher the resolution, better the

image quality, but the more expensive the camera

SimNet Concepts Support CD: “Digital Cameras”

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Web Cams

• Web cam is a video camera that can be used to take images for uploading to the Web

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5.2 Output Devices

• Output devices take information within your computer and present it to you in a form that you can understand

• Main output devices:– Monitors– Printers– Speakers

SimNet Concepts Support CD: “Overview of Output Devices”

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Flat Panel Display Devices

• Devices with flat-panel displays

• Tablet PCs

• PDAs

• Cellular phones

• Desktop computers

                     

          

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Monitors

• CRTs• Flat-panel displays

– Gas plasma– LCD (liquid crystal display)

• Passive matrix• Active matrix

– Called TFT (thin film transistor)– Separate transistor for every pixel

p. 5.137 Fig. 5-9

SimNet Concepts Support CD: “Monitors”

©2003 The McGraw-Hill Companies

Screen Talk

• Screen size measured as a diagonal line across the screen – from corner to opposite corner

• Resolution the number of pixels displayed on the screen (the higher the resolution, the closer together the dots)

• Pixels (or picture element) dots that make up the image on your screen

• Dot pitch is the distance between the centers of a pair of like-colored pixels

• Refresh rate the speed with which a monitor redraws the image of the screen, and is measured in hertz

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Printers

• Inkjet – most popular– Makes images by forcing droplets

through nozzles– Top speed is 20 pages per minute

• Laser – Forms images using an

electrostatic process– Prints between 3 and 30 pages per

minute

                     

          

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Printers - Cont

• Resolution of a printer is the number of dots per inch (dpi) it produces.

• Higher the resolution, better the image, and usually the more costly the printer

                     

          

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Printers - Cont.

• Multifunction printer:

• Scan, copy, fax, and print

• Can be either inkjet or laser

• Cost less than buying individual units

• Take up less desk space

SimNet Concepts Support CD: “Printers”

p. 5.139 Fig. 5-11

©2003 The McGraw-Hill Companies

Speakers

• A speaker is a device that produces computer output as sound

• Speakers are common devices in computer systems Examples include:• Built-in speaker

• Two-device set speakers

• Surround sound speakers

                     

          

                     

          

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I•Can: Use a Computer Without Neck and Shoulder Pain

• Computer work can lead to physical problems

• Ergonomics – deals with reducing discomfort

• Should sit up straight at your computer

SimNet Concepts Support CD: “Ergonomics”

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Using Your Computer: Ergonomics and Health

• Position your screen about the length of your arm away so that you look slightly down at it

• Your elbows, knees, and hips should form right angles

• Your back should be at a right angle to the floor

• Rest your eyes by looking away from the screen frequently

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Using Your Computer: Ergonomics and Health

• Stretch your shoulders, back, arms, and wrists at least every 30 minutes

• Stretch your hands downward and backward frequently

• Always listen to your body when it tells you that you’re uncomfortable and do something about it

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5.3 Storage Devices

• Storage device stores information to be recalled and used at a later time

• Storage device consists of:•Storage medium•Storage device

• Three major technology types for information storage:

•Magnetic•Optical or laser•Flash memory

                     

          

SimNet Concepts Support CD: “Storage Concepts”

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Storage Medium Terms

– Byte– Kilobyte (KB)– Megabytes (MB)– Gigabytes (GB)– Terabytes (TB)– Petabyte (PB)– Exabyte (EB)

= 8 bits≈ 1 Thousand Bytes≈ 1 Million Bytes≈ 1 Billion Bytes≈ 1 Trillion Bytes≈ 1 quadrillion Bytes≈ 1 quintillion Bytes

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Magnetic and Optical Storage

p. 5.142 & 5.144 Fig. 5.13 & 5.16

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Magnetic Storage Devices: Internal Magnetic Hard Disk

• Magnetic storage devices can be either internal or external• Internal magnetic hard disks are

fixed inside the system unit• External magnetic hard disks are

portable

SimNet Concepts Support CD: “Removable Disks”

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Magnetic Storage Devices: Internal Magnetic Hard Disk

• Internal hard disk is a magnetic storage device with • One or more thin platters that store

information sealed inside the disk drive.

• Read/write heads access the information on surface

• Heads read information while copying it from disk to RAM

• Heads write information when copying it from RAM to disk

                     

          

                     

          

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Magnetic Storage Devices: External Magnetic Hard Disk

• External hard disks are magnetic storage media which are portable storage units that you can connect to your computer as necessary• Great for backup storage devices• Ability to transport your hard disk

from one computer to another

                     

          

                     

          

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Hard Drives

• Long term storage system and application software

• Operating system and application software are copied from the hard disk to memory

• Capacity measured in gigabytes

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Floppy Disks and Zip Disks

• Removable magnetic storage media come in two basic types:– Traditional floppy disks– Zip disks

• These storage media are useful for:– Storing files for backup or security

purposes– Transferring files from one computer

to another

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Removable Magnetic Storage: Floppy Disk

• Floppy Mylar disk– Housed inside a hard plastic

casing– Thin, flexible plastic disk

• 3.5 inch floppy disks– also called floppies, diskettes,

floppy disks

– Holds about 1.44 megabytes of information

• High-capacity disks– Zip® disk

p. 5.144 Fig. 5.15

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Removable Magnetic Storage: Zip Disk

• High capacity plastic platter disk– Called removable hard disks– Provide a higher storage capacity than Mylar

disks• Example - Zip® disk with capacity of 100MB,

250MB, and 750MB

                     

          

                     

          

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Optical Storage

• CDs• DVDs• Both are optical

storage and have three formats:– Read-only– Write-once– Read-and-write

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Optical Storage Media

• Read-Only CD-ROM DVD-ROM

• One-Time Writable CD-R DVD-R DVD+R

• Fully Read-and-Write CD-RW DVD-RW or

DVD+RW or

DVD-RAM

SimNet Concepts Support CD: “CDs and DVDs”

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Flash Memory Cards

• Flash memory cards have high-capacity storage laminated inside a small piece of plastic

• Flash flash memory cards do not need a drive with moving parts to operate

                     

          

                     

          

                     

          

                     

          

                     

                   

                     

          

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Flash Memory Talk

• CompactFlash (CF) • xD-Picture Card (xD) • SmartMedia (SM) Card • SecureDigital (SD) card and

MultiMediaCards (MMC) • Memory Stick Media

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Flash Memory Card Readers

• Some devices have flash memory slots into which you slide your flash memory card

• Other devices can use an external flash memory card reader in order to transfer information

• A flash memory drive is a flash memory storage medium for a computer that is small enough to fit in your pocket and usually plugs directly into a USB port