Every transfer is an output from one device and an input into another. Typical pointing devices are: mouse, trackball, touch pad, trackpoint, graphics tablet, joystick, and touch screen. For hardcopy printed output, you need some kind of printer attached to your computer or available over a network. It is important to understand the different types of peripherals and what their main uses are in case you need to add a device to your computer. Such devices make up the equipment of modern systems.
Video digitiser A video digitiser takes an image from a video camera or television and digitises it so it can be read by, and stored on, a computer. This is a ball which is half inserted and by moving fingers on the ball, the pointer can be moved. Most of the latest mouses, these days, include a wheel in the middle of two buttons that help us to scroll through documents more easily. Serial connections, which use relatively few wires, are generally simpler and slower than parallel connections. These files can be copied to a computer and later edited.
Joysticks Trackball Joysticks and other game controllers can also be connected to a computer as pointing devices. The scanner converts any type of printed or written information including photographs into digital pulses, which can be manipulated by the computer. A bus also known as a port can be either or , depending on whether the data path carries one bit at a time serial or many at once parallel. The smaller the pixels, the better the image clarity or resolution. Video cards are also called video display adapters, and graphics cards. Universal serial bus is a common serial bus. These printers form the image on the page by spraying tiny droplets of ink from the print head.
The mouse is rolled over the mouse pad, which in turn controls the movement of the cursor in the screen. 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. Mouse Mouse is another input device which is commonly found connected with the computers. Think and Answer What kind of printer do you use in your school? The reflected light is received by the photocells. Your computer must produce a video signal that a monitor can display.
Some devices, such as video display terminals and hubs, may provide both input and output. It may be a handheld scanner or may be embedded in a stationary scanner. The user can make choices and press button images on the screen. Computers also produce sound output, ranging from simple beeps alerting the user, to impressive game sound effects, to concert quality music. Webcams commonly have microphones built-in too. The print quality of this printer is better than that of Dot Matrix Printer and it prints without making any noise. Scanners, on the other hand, input text and image photos into the computer.
Scanner A scanner can be used to digitise images. When the mouse is moved on the mouse pad, a light beam underneath reflect to give motion to the pointer on the screen. The ball has 2 wheels of the sides, which in turn mousse with the movement of the ball. Using a graphics tablet a designer can produce very accurate on-screen drawings as if they were drawing on paper. Dot-Matrix , Daisy Wheel, Etc. It can print in both, color as well as black and white.
In construction, joysticks are used to control machinery such as cranes. A sound card is an example of a multimedia output device as is a monitor that can display graphics. Digitizer is also known as Tablet or Graphics Tablet as it converts graphics and pictorial data into binary inputs. Examples of these printers are inkjet printer or a Line printer because it has to store each page in memory before printing it. The joystick has a vertical stick with a track ball at its bottom. The number of pixels that a monitor can show on its screen is referred to as the resolution of the screen. The sound is digitized—turned into numbers that represent the original analog sound waves—and stored in the computer to later processing and playback.
Nowadays cordless mouse is very popular. The light is absorbed by the dark areas but reflected from the bright areas. The user moves the ball directly, while the device itself remains stationary. If the disc has been , you cannot write any more information to that disc. It is used when some information is available on paper and it is to be transferred to the hard disk of the computer for further manipulation.
Line Printer This is high speed printer that prints one line at a time. Color printing is also possible. A digital representation can then be modified and sent electronically if desired. These printers are generally used for word-processing in offices that require a few letters to be sent here and there with very nice quality. They allow the user to manipulate and dictate tasks—ranging from surfing the Internet to writing documents.