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8/4/2019 Presentation Meghna
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INPUT AND
OUTPUT
DEVICES
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Introduction
• Devices which are a means of communication between the computer andthe outside world are called PERIPHERAL
DEVICES• The processors which are required toconvert the input data into machine
readable form and to convert the outputgenerated by the computer into humanreadable form are known as INPUT/OUTPUT(I/O) interfaces.
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Input Devices•
Those peripheral devices which supply information i.e. dataand program from the outside world to the computer arecalled INPUT DEVICES.
– Keyboard – Mouse – Light Pen – Joystick – Track Ball – Touch Screen – Scanners
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Keyboard • Similar to typewriter keyboard.• Keys on keyboard consist up of letters, numbers, symbols
and function keys.• Special keys like Tab, Del, Ctrl, PgUp, PgDn,etc.• Easy to use and offers number of facilities.• Can edit the input data very easily.• Relatively inexpensive.
Input Device
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Mouse• A pointing device.• Control and manipulate cursor movement on monitor.• Has three or four buttons on it and roller ball which signals
the movements on a flat surface.•
Move fast from one part of the screen to the other.
Input Device
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Light Pen• It is a point & draw device .• hold the pen by users hand.• For written information directly write on a special
pad.• Specially useful in Computer Aided Design (CAD)
application
Input Device
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Joystick• Widely used in computer or video games.• The direction and speed with which the joystick is moved is
converted into digital signal and sent to the computer system.• This in turn controls the movement of the cursor on the
screen.
Input Device
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Touch Screen• A touch panel is transparent plate.• Input is registered when a finger or any other object
comes in contact with the plate.
Input Device
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Scanner• It is able to directly enter text and images into the
computer memory.• Eliminated the duplication work of entering data .• This result into increase in speed of data entry and
accuracy.
Input Device
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Bar Code Reader • It reads bar coded data.• Laser beam scanner is used to read the bar code.• Most commonly used bar code is the Universal Product
Code (UPC).
Input Device
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Output Devices•
The output devices allow computer to communicatewith the outside world by accepting data from thecomputer & transforming I into user readable form.
– Printers – Monitor – Plotter – Speakers
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Printer• It produces the output from the
computer on the paper.• Produces a hard copy i.e. permanent
copy of the result which can be storedand read later.
Output Device
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Monitors•
Monitor is a device like television screenwhich is used to display information.• The resolution of monitors is the number of
picture elements.• Monitors are of two types -
– Cathode Ray Tube Monitor (CRT) –
Flat Panel Display
Output Device
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Cathode Ray Tube Monitor
Output Device
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Flat Panel Display
Output Device
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Plotter•
A plotter is a an output device used inapplications where printouts of graphs anddrawings are required
• Plotters are of two types - – Flat Bed Plotter – Drum Plotter
Output Device
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Flat Bed Plotters
Output Device
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Drum Plotters
Output Device
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Speaker
Output Device