The devices which are used to input the data and the programs in the computer are known as "Input Devices". or Input device can read data and convert them to a form that a computer can use. Output Device
can produce the final product of machine processing into a form usable
by humans. It provides man to machine communication. Some of the I/O
devices are explained below:
(1) Keyboard : Keyboard is used in the input phase of a computer-based information system. Keyboard is most common input device is used today. The data and instructions are input by typing on the keyboard. The message typed on the keyboard reaches the memory
unit of a computer. It’s connected to a computer via a cable. Apart
from alphabet and numeral keys, it has other function keys for
performing different functions.
(2) Mouse
: It’s a pointing device. The mouse is rolled over the mouse pad, which
in turn controls the movement of the cursor in the screen. We can
click, double click or drag the mouse. Most of the mouse’s have a ball
beneath them, which rotates when the mouse in moved. The ball has 2
wheels of the sides, which in turn mousse with the movement of the ball.
The sensor notifies the speed of its movements to the computer, which
in turn moves the cursor/pointer on the screen.
(3) Scanner
: Scanners are used to enter information directly in to the computers
memory. This device works like a Xerox machine. The scanner converts any
type of printed or written information including photographs into
digital pulses, which can be manipulated by the computer.
(4) Track Ball
: Track ball is similar to the upside- down design of the mouse. The
user moves the ball directly, while the device itself remains
stationary. The user spins the ball in various directions to effect the
screen movements.
(5) Light Pen
: This is an input device which is used to draw lines or figures on a
computer screen. It’s touched to the CRT screen where it can detect
raster on the screen as it passes.
(6) Optical Character Rader
: It’s a device which detects alpha numeric characters printed or
written on a paper. The text which is to be scanned is illuminated by a
low frequency light source. The light is absorbed by the dark areas but
reflected from the bright areas. The reflected light is received by the
photocells.
(7) Bar Code Reader
: This device reads bar codes and coverts them into electric pulses to
be processed by a computer. A bar code is nothing but data coded in form
of light and dark bars.
(8) Voice Input Systems
: This devices converts spoken words to M/C language form. A micro
phone is used to convert human speech into electric signals. The signal
pattern is then transmitted to a computer when it’s compared to a
dictionary of patterns that have been previously placed in a storage
unit of computer. When a close match is found, the word is recognized.
(9) Plotter
: Plotter is an O/P device that is used to produce graphical O/P on
papers. It uses single color or multi color pens to draw pictures as
blue print etc.
(10) Digital Camera
: It converts graphics directly into digital form. It looks like an
ordinary camera, but no film is used therein, instead a CCD (changed
coupled Divide) Electronic chip in used. When light falls, on the chip
though the lens, it converts light waves into electrical waves.
Chapter : Memory & Input/Output Unit
- Computer Fundamental
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