3. INPUT AND OUTPUT DEVICES
In computing, input/output is the communication between an information processing system (such as a computer) and the outside world, possibly a human or another information processing system.
4. INPUT AND OUTPUT DEVICES
The term can also be used as part of an action; to "perform I/O" is to perform an input or output operation. I/O devices are used by a person (or other system) to communicate with a computer.
5. INPUT AND OUTPUT DEVICES
For instance, a keyboard or a mouse may be an input device for a computer.
While monitors and printers
are considered output devices for a computer.
6. INPUT AND OUTPUT DEVICES
Devices for communication between computers, such as modems and network cards, typically serve for both input and output.
8. INPUT AND OUTPUT DEVICES
To understand more the difference between an input and output device, you must understand the difference between input and
output.
9. INPUT AND OUTPUT DEVICES
Any information or data that's entered or sent to the computer to be processed is considered input and anything that is displayed from the computer is output.
10. INPUT AND OUTPUT DEVICES
Therefore, an input device such as a computer keyboard is capable of having information sent to the computer, but does not display (output) any information. An output device such as a computer printer can print information from the computer but does not send any information (input) to the computer.
15. INPUT DEVICES
The mouse pointing device sits on your work surface and is moved with your hand.
The newer optical mouse does not use a rolling ball, but instead uses a light and a small optical sensor to detect the motion of the mouse by tracking a tiny image of the desk surface.
16. INPUT DEVICES
• A cordless or wireless mouse communicates with the computer via radio waves (often using BlueTooth hardware and protocol) so that a cord is not needed (but such mice need internal batteries).
17. INPUT DEVICES
Most laptop computers today have a touch pad pointing device. You move the on-screen cursor by sliding your finger along the surface of the touch pad.
Touch Pad
18. INPUT DEVICES
Some sub-notebook computers (such as the IBM ThinkPad), which lack room for even a touch pad, incorporate atrackpoint
Trackpoint
It is a small rubber band acts like a little joystick that can be used to control the position of the on-screen cursor.
19. INPUT DEVICES
The trackball is sort of like an upside-down mouse, with the ball located on top.
Trackball
20. INPUT DEVICES
A graphics tablet consists of an electronic writing area and a special “pen” that works with it. Graphics tablets allows artists to create graphical images with motions and actions similar to using more traditional drawing tools.
Graphics Tablet
21. INPUT DEVICES
Some computers, especially small hand-held PDAs, have touch sensitive display screens. The user can make choices and press button images on the screen.
Touch Screen
22. INPUT DEVICES
A scanner is a device that images a printed page or graphic by digitizing it, producing an image made of tiny pixels of different brightness and color values which are represented numerically and sent to the computer.
Joysticks
Scanners
• A microphone can be attached to a computer to record sound (usually through a sound card input or circuitry built into the motherboard). The sound is digitized—turned
23. INPUT DEVICES
Microphone
• A microphone can be attached to a computer to record sound (usually through a sound card input or circuitry built into the motherboard). The sound is digitized—turned into numbers that represent the original analog sound waves—and stored in the computer to later processing and playback.
24. INPUT DEVICES
MIDI Devices
MIDI (Musical Instrument Digital Interface) is a system designed to transmit information between electronic musical instruments. A MIDI musical keyboard can be attached to a computer and allow a performer to play music that is captured by the computer system as a sequence of notes with the associated timing (instead of recording digitized sound waves).
25. INPUT DEVICES
Other Input Devices
Barcode Reader
Video Capture Hardware
Cameras/Digital Camera
Web Cam
Electronic Whiteboard
27. OUTPUT DEVICES
The traditional output device of a personal computer has been the CRT (Cathode Ray Tube) monitor.
CRT Monitor
28. OUTPUT DEVICES
A flat panel display usually uses an LCD (Liquid Crystal Display) screen to display output from the computer. The LCD consists of several thin layers that polarize the light passing through them.
Flat Panel Monitor
29. OUTPUT DEVICES
The most common type of printer for home systems is the color ink jet printer.
Ink Jet Printer
30. OUTPUT DEVICES
A laser printer produces good quality images by the same technology that photocopiers use.
Laser Printer
31. OUTPUT DEVICES
Multimedia is a term describing computer output that includes sound, text, graphics, movies, and animation. A sound card is an example of a multimedia output device (as is a monitor that can display graphics).
Sound Output
