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Presented to : Tanvir Bin Azgar (Sir)

Presented by :

Muhammad Abdullah ID : 142-0076-511

Department Of EEE

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Input and Output Devices

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Input and Output Devices

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Introduction

Do you ever wonder how information gets into your computer and how comes out in a form you can use ? It is possible with the help of input and output devices.

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Input DevicesDefinition :

“An electromechanical device that can be used to enter data and instructions into a

computer.”

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Keyboard“A keyboard is a human interface device which is represented as a layout of button or keys.”It has some Features as• Typewriter keyboard with numeric keypad• Special purpose keys• Toggle and combination keys

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Pointing DevicesDefinition : “An input device used to control a pointer on the screen.”

Mouse:“mouse can be used to Control and manipulate cursor movement on monitor.” Types of Mouse : i) Mechanical ii) Optical iii) Cordless or wireless

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Some pointing devices are :

TrackballPointing StickJoystickTouch PadTouch Screen Light Pen

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Optical Input Devices“optical input devices that uses light as a source of

input. They eliminate the need for manual entry of data, thus accuracy increases.

Scanner:“scanners can be used to copy the image or text on paper into a digital format that can be used by the computer.”

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Other Optical Input Devices are:Optical scannersFlatbedPortable

Bar code readers:“A Barcode Reader is an electronic device which is used for reading printed barcodes. This device directs a light beam across the bar code while it measures the amount of light which is reflected back. “

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Character and mark recognition devicesScanners that recognize special characters & marks Magnetic ink character recognition (MICR)Optical-character recognition (OCR)Optical-mark recognition (OMR)

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Audio Input DevicesDefinition :

“Audio input devices record the analog sound and convert it into digital form for further processing.”Some Audio input devices are :

Voice recognition Microphone Musical Instrument Digital Interface

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Video Input Definition : “video input devices that can be used to entering full motion recording into a computer.“Some video input devices are

Digital Camera webcam Video capture card

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Output DevicesDefinition

“Output devices can be used to receive information from the computer “

The output can be in two forms:

Soft copy

Hard copy

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MonitorDefinition

“A monitor is a peripheral device which displays computer output on a screen . Screen output is referred to as soft copy”

Features Resolution-pixelsDot pitchRefresh ratSize

Types of monitors Cathode Ray Tube (CRT) Liquid crystal Display (LCD)

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Printer Definition

“A printer is a peripheral device that produces a physical copy or hard copy of the computer’s output.”

Types of Printer :

Impact Printers • Dot Matrix Printer• Daisy Wheel Printer

Non Impact Printers• Laser Printer• Ink-Jet Printer • Thermal Printer

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PlotterDefinition

“A plotter is an output device that is used to produce high quality graphics in a variety of colors.”

Types of PlotterFlatbed PlotterDrum plotter

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Audio output DevicesDefinition

“Audio Output Devices can be used to translates audio information from the computer into sounds that people can understand.”

Common audio output devicesSpeakersHeadphones

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ProjectorDefinition “Projector can be used to displays

computer information on big screen so that many will able to see the show.”

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Computer Output Microfilm (COM)This technology is used to record computer

output as a microscopic film images.Information is recorded on a roll of film.COM devices are used applications where

there are large volumes of data.

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Combination Input and Output Devices

Many devices combine input and output capabilitiesFax machinesMultifunction devicesInternet telephones

known as Telephonyand Voice-over IP (VoIP)

Terminals

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Fax machinesDefinition :

“A fax machine refers to a device or equipment that does telephonic transmission of scanned material. It scans the original document and converts it into a bitmap. It then uses electronic signals to send the document to another recipient. “

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TerminalsAn input and output deviceConnects to a mainframe or serverTypes of terminals

Dumb terminal Intelligent terminalNetwork terminalInternet terminal

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ReferenceComputer Organization & Design (4th Ed), Patterson and

Hennessy, Morgan Kaufmann 2008.Digital Design and Computer Architecture, Harris and

Harris, Morgan Kaufmann 2007.Structured Computer Organization (5th Ed),Tannenbaum,

Prentice-Hall 2005.

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