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.
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