1 Lesson 2 Input, Output, and Processing Computer Literacy BASICS: A Comprehensive Guide to IC 3, 4 th Edition Morrison / Wells

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Lesson 2Input, Output, and Processing

Computer Literacy BASICS: A Comprehensive Guide to IC3, 4th Edition

Morrison / Wells

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Morrison / Wells CLB: A Comp Guide to IC3 4E

Skip to Slide 3

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Morrison / Wells CLB: A Comp Guide to IC3 4E333

Input and Output Devices

Input Device: Enables someone to enter data and commands into a computer.– Keyboard, mouse, scanner, etc.

Output Device: Enables the computer to give you the results of the processed data.– Monitor, projector, printer, etc.

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Standard Input Devices

Modem:

- A modem is a device that allows one computer to talk to another.

- Considered an Input and Output device due to its functions.

Keyboards:

- The keyboard is the most commonly used input device for entering text and numbers into a computer.

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Standard Input Devices (continued)

Keyboards (continued):– Ergonomic– Cordless/wireless– Specialized– Security– Foldable/flexible– Laser/Virtual– NIK (Nearly

Indestructible Keyboard)

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Keyboards (continued):- Ergonomic: more natural/comfortable hand,

wrist, and arm positions.- Cordless/Wireless: battery-powered that

transmits data using wireless technology.- Specialized: specialized keys that represent

items (Ex. Fast Food keyboards)

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Keyboards (continued):- Security: provides security features such as

biometric finger-print reader, magnetic stripe, and smart card readers.

- Foldable/Flexible: easily transported, soft, and water resistant. Used with mobile devices.

- Laser virtual: a laser beam generates a full-size keyboard. Used with computers, phones, and tablets.

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Keyboards (continued):- NIK (Nearly Indestructible Keyboard): flexible and

can be washed with soap or with spray cleaner.

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Ergonomic Keyboard

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Pointing Devices:o A pointing device is an input device you use to

position the pointer on the screen.o The most common pointing device for

personal computers is the mouse.– Mechanical– Optomechanical– Optical– Wireless

– Trackball mouse– Radio frequency– Foldable mouse

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Pointing Devices (continued):

- The trackball works like a mouse turned upside down; the ball is on top of the device.

- A common feature on laptop computers is the touchpad, with a specialized surface that can convert the motion and position of your fingers to a relative position on screen.

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-Commonly known items regarding a mouse: The left button is used for most operations.

Most mice have 3 buttons.The right button is used to display shortcut menu options.

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Pointing Devices (continued):-Commonly known items regarding a mouse:

Sensors determine the direction and distance on a mechanical mouse.

Lasers detect an optical mouse’s movement. A wireless mouse uses infrared waves to

communicate with the computer. A mouse can be used to select text or portions of

text by dragging the mouse pointer over the text.

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- Some notebook computers contain a pointing stick, a pressure-sensitive device that looks like a pencil eraser and is located on the keyboard, generally between the G, H, and B keys.

- Audio input is sound entered into a computer.

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***QUICK RECAP***

What is an input device?

A device that enables someone to enter data and commands into a computer.

This type of keyboard can be washed with soap or spray cleaner?

NIK (Nearly Indestructible Keyboard)

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Standard Output Devices

Monitors:

- Desktop computers typically use a monitor as their display device, including CRT, LCD, and gas plasma.

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Standard Output Devices

Monitors:- CRT (Cathode Ray Tube): older type of monitor

that is similar to older types of TVs. Obsolete now due to flat-panel monitors.

- LCD (Liquid Crystal Display): produces an image by manipulating light within a layer of liquid crystal cells.

- Gas Plasma: consists of tiny amount of gas that is activated by electrical charge.

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Standard Output Devices (continued)

Printers:- Printers produce a paper copy, or hard copy, of

processing results.- Features of printers: Speed, Print Quality, and Price

- A laser printer produces high-quality output and images similar to copy machines.

- An inkjet printer provides good-quality color printing for less expense. Sprays ink onto paper.

- A Dot-Matrix printer strikes a ribbon with pins to transfer ink onto paper and are seldom used today.

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Standard Output Devices (continued)

Printer Classifications– Impact: actually strikes the paper to form letters

and images. (Ex. Dot matrix – mostly obsolete)– Nonimpact: form characters without striking the

paper. (Ex. Inkjet and laser printers)• Speakers

- Generate sound from speaking or music.- Headsets or headphones for privacy.

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***Quick Recap***

This type of monitor produces an image by manipulating light within a layer of liquid crystal cells.

LCD

This type of printer squirts ink as it passes over a media.

Inkjet printer

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Specialized Input Devices

Digital Cameras:- The pictures you take are stored digitally and

then transferred to the computer’s memory.- Uses a variety of storage media: flash

memory cards, USB keys, memory sticks, mini-discs and other solid-state storage devices.

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Digital Cameras (continued):- Video input is a set of full-motion images captured

with a video camera. - Storage media for video input devices are hard

drive, CD, DVD.- Webcams are video-capturing cameras connected to

computers.- Can also display images through the World Wide

Web.

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Specialized Input Devices (continued)

Game Controllers:

- You use joysticks and wheels most often for games.

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Scanners/Bar Code Readers:

- Scanners are devices that can change images into codes for input to the computer.– Image scanners: convert images into electric form

that you can store in your computer’s memory.– Bar code scanners: reads bar lines that are printed

on objects.– Magnetic scanners: read encoded information on

credit cards.

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Scanners/Bar Code Readers (continued):– Wireless scanners: use Bluetooth technology to

scan barcode data.– Optical character recognition (OCR) and

optical mark recognition (OMR) scanners: use a light source to read characters, marks and codes; then converted back into digital format.

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Touch Display Screen:

- A special screen that reacts to direct touches within the display area, usually from a person’s finger or hand.

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Stylus:

- A stylus and digital pen are pen-like writing instruments used to enter information by writing on a screen on a mobile device or using the pen as a pointer.

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Environmental Probes and Sensors:

- Workers can view information such as the temperature and humidity of a remote environment, smoke detector readings, and pollution control readings.

Remote Controls:

- Used to manage devices such as televisions, lights, and fans.

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Security Devices:- Biometrics is an authentication technique using

automated methods of recognizing a person based on a physiological or behavioral characteristic.- Used for security purposes.- Commonly based on finger prints, face,

handwriting or voice.- Less common uses: retina/iris scan, or hand

geometry.

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Virtual Devices:

- Use the synchronized positioning of light-emitting and sensing devices to detect user input.

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Touch-Sensitive Pads:- On a portable device, enables you to scroll through a

list, adjust the volume, play music, view videos or pictures, and customize settings.

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Input Devices for the Physically Challenged:- A variety of special input devices are available for the

physically challenged.- Keyboards that can be operated by a single hand

or feet.- Joystick computer mouse that uses lips, chin, or

tongue.- Human Computer Interface that uses eye control

to move a pointer and make selections.

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Skip to slide 35.

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***QUICK RECAP***

This type of scanner reads bar lines that are printed on objects.

Barcode scanners

This technique uses methods for recognizing a person based on finger prints and voice?

biometrics

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Specialized Output Devices

Specialized Output Devices:– Projectors– Fax machines and fax modems– Multifunction printer– Control devices/robots

Specialized Printers:– Thermal– Mobile– Label and postage– Plotters/large-format

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Specialized Output Devices (continued)

Output Devices for the Physically Challenged:– Screen magnifiers– Screen readers– Voice synthesizers

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Connecting Input and Output Devices to a Computer

Ports and Connectors:- A port, also called a jack, is an interface to which a

peripheral device attaches to or communicates with the system unit or other peripheral devices.

- A Universal Serial Bus (USB) port can connect up to 127 peripheral devices with a single connector and transfer data at rates of up to 200 million bits per second (Mbps).

- Plug and play refers to the ability of a computer system to configure expansion boards and other devices automatically.

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Connecting Input and Output Devices to a Computer (continued)

Ports and Connectors (continued):

- FireWire: supports data transfers up to 400 Mbps and can connect up to 63 external devices.

- Special-purpose ports:– SCSI: standard interface for connecting peripherals such as

hard drives and printers.– IrDA: a wireless standard that allows data to be transferred

between devices using infrared light instead of cables.– Bluetooth: uses radio waves between voice and mobile

devices.

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Ports and Connectors (continued):- Expansion slots are openings on the motherboard

where an expansion board can be inserted.- Expansion boards are also called adapter cards,

expansion cards, add-ins, etc.

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Hardware Installation:- For most hardware devices to work, they

need a set of instructions that communicates with the computer’s operating system. This set of instructions is called a driver.

- If the device does not come with a driver, you must download and install the driver manually.

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***QUICK RECAP***

Name (1) type of output device for the physically challenged.

Screen magnifier, screen reader, voice synthesizer

This type of port can connect up to 127 peripheral devices with a single connector.

USB (Universal Serial Bus)

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Considering Computer Performance Factors

A variety of factors can affect a computer’s performance.– Microprocessor: The higher the generation, the

faster and better the processing speed.– Random Access Memory (RAM): Helps to speed

up the processing cycle.– Hard disk: The bigger and faster the hard drive,

the faster it can process data.– Video: Need adequate video memory.

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Computer Viruses

Can cause tremendous damage to your computer files.

A program that spreads from one computer to another and interferes with the computers’ operation.

Can be stored on a computer for weeks or months and may not cause damage.

Spread by email attachments or downloaded files. Not all viruses cause damage; could be a prank. Install anti-virus software to protect yourself.

Documents

1 Lesson 2 Input, Output, and Processing Computer Literacy BASICS: A Comprehensive Guide to IC 3, 4 th Edition Morrison / Wells