INPUT and OUTPUT

What is I/O? I/O is short

for input/output (pronounced "eye-oh"). The term I/O is used to describe any program, operation or device that transfers data to or from a computer and to or from a peripheral device. Every transfer is an output from one device and an input into another. 

What is Input?

Input is any information or data that is entered or sent to the computer to be processed.

.An Input Device is a piece of hardware that is used to enter

data into a computer or content into a computer system.

INPUT DEVICES

Input devices can be divided into two categories:

Manual Input DeviceAutomatic Input Device

Manual Input DeviceManual input devices are those

peripheral accessories of a computer system that allow

users to directly interact with that computer and its systems.Examples: mouse, keyboard, joystick,

digital camera, and microphone

Automatic Input Device

Automatic input devices are those peripheral accessories of a computer system that enable

data to be entered without human intervention.

Examples: barcode reader, sensors, biometric devices, and magnetic stripe

readers

Mouse

Keyboard

Joystick

Trackball

Scanner

Barcode Reader

MicrophoneDigital Camera

Light Pen

Webcam

Mouse  The mouse is

a computer input device used to move a cursor around the

screen.

Keyboard A keyboard is a typewriter-style device, which uses an arrangement of buttons or keys, to act as mechanical levers or

electronic switches.

MicrophoneA microphone is an acoustic-to-electric

transducer or sensor that converts sound in air into an

electrical signal.

Digital CameraThe pictures in the camera can be placed in a computer. The pictures

become information inside the computer.

ScannerA picture can be

placed in the computer with the use of a scanner.

The scanner takes the picture

information and puts it into the

computer.

Trackball The trackball is

an upside-down mouse that rotates in place within a socket.

Joystick  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. 

Light Pen   A small,

photosensitive device connected to

a computer and moved by hand over an output display in order to manipulate information in the

computer.

Barcode Reader  A barcode

reader (or barcode scanner) is an

electronic device for reading

printed barcodes.

WebcamA webcam is a video camera that feeds or streams its image in real time to or

through a computer to computer network. 

What is

Output?

Output is anything that is displayed from the computer.

An Output Device is a piece of hardware that obeys a

computer command to do something that is real.

OUTPUT DEVICES

Printer

PlotterSpeakers

Monitor

PrinterA printer takes information from a computer and prints it out.

MonitorA monitor takes information and displays it on the screen for you to look at.

SpeakersA computer uses speakers to play sound and music from the information it has.

PlotterThe plotter is a computer printer for printing vector graphics. Plotters are used to print designs of ships and machines, plans for buildings and so on.