An input device is any peripheral (piece of
computer hardware equipment) used to provide
data and control signals to an information
processing system (such as a computer). Input
and output devices make up the hardware
interface between a computer as a scanner or
It is a peripheral devices used to
Input text and other data in the
It is an input devices used for clicking,
Pointing, and dragging object in
A scanner is a device that can read text or illustrations
printed on paper and translate the information into a
form the computer can use. A scanner works by digitizing
an image -- dividing it into a grid of boxesand representing
each box with either a zero or a one, depending on whether
the box is filled in. (For color and gray scaling, the same
principle applies, but each box is then represented by
up to 24 bits.) The resulting matrix of bits, called a
bit map, can then bestored in a file, displayed on a screen
, and manipulated by programs.
A joystick is an input device consisting of a stick that pivots
on a base and reports its angle or direction to the device it
is controlling. Joysticks are often used to control video
games, and usually have one or more push-buttons
whose state can also be read by the computer.
Computer processing cycle the stages in which the
computer uses to process data that that has been sent into
the computer by the input and some of these devices are the
keyboard, mouse etc.
After this stage the data has to be processed , so the data
goes into the micro processor to be processed into
When the data is produced or processed, it has to come
out , so it is brought out through the output or output devices
like printer and the monitor.
After that it has to be stored ,so it can be stored in devices
like cd rom, pendrives and even thecomputer
A data storage device is a device for recording (storing)
information (data). Recording can be done using virtually
any form of energy, spanning from manual muscle power in
handwriting, to acoustic vibrations in phonographic
recording, to electromagnetic energy modulating
magnetic tape and optical discs.
A storage device may hold information, process
information, or both. A device that only holds information is
a recording medium. Devices that process information (data
storage equipment) may either access a separate portable
(removable) recording medium or a permanent component
to store and retrieve information.
Magnetic storage uses different
patterns of magnetization on a magnetically
coated surface to store information.
Magnetic storage is non-volatile. The information is accessed
using one or more read/write heads which may contain one or
more recording transducers. A read/write head only covers
a part of the surface so that the head or medium or both must
be moved relative to another inorder to access data.
In modern computers,magnetic storage will take these forms:
Floppy disk, used for off-line storage
Hard disk drive, used for secondary storage
The USB mass storage device class or USB MSC or UMS
is a set of computing communications protocols defined by the
USB Implementers Forum that run on the Universal Serial Bus.
The standard provides an interface to a variety of storage devices.
Some of the devices which are connected to computers via this standard are:
external magnetic hard drives
external optical drives, including CD and DVD reader and writer drives
portable flash memory devices
adapters bridging between standard flash memory cards and a USB connection
various digital audio players & portable media players
Optical storage, the typical Optical disc,
stores information in deformities on the surface of a circular
disc and reads this information by illuminating
thesurface with a laser diode and observing
the reflection. Optical disc storageis non-volatile.
The deformities may bepermanent (read only media ),
Formed once (write once media) or reversible
(recordable or read/write media).
The following forms are currently in common use:
CD, CD-ROM, DVD, BD-ROM: Read only storage, used for mass
distribution of digital information (music, video, computer programs)
CD-R, DVD-R, DVD+R BD-R: Write once storage,
used for tertiary and off-line storage
CD-RW, DVD-RW, DVD+RW, DVD-RAM, BD-RE: Slow write, fast
read storage, used for tertiary and off-line storage
Ultra Density Optical or UDO is similar in capacity to
BD-R or BD-RE and is slow write,
fast read storage used for tertiary and off-line storage.
An output device is any piece of computer hardware
equipment used to communicate the results of
data processing carried out by an
information processing system (such as a computer) to the
In computing, input/output, or I/O, refers to the
communication between an information processing system
(such as a computer), and the outside world. Inputs are the
signals or data sent to the system, and outputs are the
signals or data sent by the system to the outside of
PC-Speaker is a driver for the modest sound output device
that comes standard with most (perhaps all?) IBM PC clones.
It is installed as part of the kernel or as a
loadable module; either way, the kernel needs to be
changed. PC-Speaker comes with a small set of
programs to use with it—I have compiled
these programs on my system without trouble.
Most computers use this display as the main output device
There are two different types of display
Desktop Monitors : These work in much the same way as a
Liquid Crystal Displays (LCDs) :
These displays are completely flat and
so can be used in portable computers
and other small devices such as
calculators. They are more
expensive to make than
In computing, a printer is a peripheral which
produces a hard copy
(permanent readable text and/or graphics)
of documents stored in electronic form,
usually on physical print media such
as paper or transparencies.
Headphones are a pair of small loudspeakers,
or less commonly a single speaker,
with a way of holding them close to a user's ears and
a means of connecting them to a signal
source such as an audio amplifier, radio or CD player.