input and output devices definition pdf

Input And Output Devices Definition Pdf

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In this lesson students consider a number of computing devices to determine what types of inputs and outputs they use.

Paul's passion for technology and digital media goes back over 30 years.

Such devices make up the peripheral equipment of modern digital computer systems. Peripherals are commonly divided into three kinds: input devices, output devices, and storage devices which partake of the characteristics of the first two. An input device converts incoming data and instructions into a pattern of electrical signals in binary code that are comprehensible to a digital computer. An output device reverses the process, translating the digitized signals into a form intelligible to the user. At one time punched-card and paper-tape readers were extensively used for inputting, but these have now been supplanted by more efficient devices.

6 Major Difference Between Input And Output Device With Examples

A peripheral device is generally defined as any auxiliary device such as a computer mouse or keyboard, that connects to and works with the computer in some way. RAM—random access memory—straddles the line between peripheral and primary component; it is technically a storage peripheral, but is required for every major function of a modern computer and removing the RAM will effectively disable any modern machine. Many new devices such as digital watches, smartphones and tablet computers have interfaces which allow them to be used as a peripheral by a full computer, though they are not host-dependent as other peripheral devices are. According to the most technical definition, the only pieces of a computer not considered to be peripherals are the central processing unit, power supply, motherboard, and computer case. Usually, the word peripheral is used to refer to a device external to the computer case, like a scanner, but the devices located inside the computer case are also technically peripherals. In a system on a chip, peripherals are incorporated into the same integrated circuit as the central processing unit.

An input device is essentially a piece of hardware component used to provide data and control signals to an information processing system such as computer or information device. Common inputs devices on modern computers include keyboards, mouse and touch screen which are used to enter commands and data directly. Other examples of input devices include scanners, digital cameras, joysticks and microphones. An output device is any hardware component that use received data from a computer to perform a task. The data received by the output device can be text, graphic, tactile, audio or video. Three most commonly used output devices are a printer, a monitor and speakers. A printer is used to generate a hard copy or graphics on a physical medium such as paper.

An input device sends information to a computer system for processing , and an output device reproduces or displays the results of that processing. Input devices only allow for input of data to a computer and output devices only receive the output of data from another device. Most devices are only input devices or output devices, as they can only accept data input from a user or output data generated by a computer. For example, as shown in the top half of the image, a keyboard sends electrical signals, which are received as input. Those signals are then interpreted by the computer and displayed, or output , on the monitor as text or images. In the lower half of the image, the computer sends, or outputs , data to a printer. Then, that data is printed onto a piece of paper, which is also considered output.

What are input and output devices?

For other information, see the Ghostscript overview. Overview High level devices are Ghostscript output devices which do not render to a raster, in general they produce 'vector' as opposed to bitmap output. Such devices currently include: pdfwrite, ps2write, eps2write, txtwrite, xpswrite, pxlmono, pxlcolor and docxwrite. Although these devices produce output which is not a raster, they still work in the same general fashion as all Ghostscript devices. The device decides whether to handle the primitive itself, or call upon the graphics library to render the primitive to the final raster. Primitives are quite low level graphics operations; as an example consider the PDF sequence '0 0 re f'.

Inputs are the signals or data received by the system and outputs are the signals or data sent from it. For instance, a keyboard or computer mouse is an input device for a computer, while monitors and printers are output devices. Devices for communication between computers, such as modems and network cards , typically perform both input and output operations. The designation of a device as either input or output depends on perspective. Mice and keyboards take physical movements that the human user outputs and convert them into input signals that a computer can understand; the output from these devices is the computer's input. Similarly, printers and monitors take signals that computers output as input, and they convert these signals into a representation that human users can understand.

Input/output

For other information, see the Ghostscript overview. You may also be interested in how to build Ghostscript and install it , as well as the description of the driver interface. Documentation for some older, superceded devices has been moved to another document. In general such devices are deprecated and will be removed in future versions of Ghostscript.

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 Это был девиз туристского бюро Севильи.

Input devices

 Да. Кошачья жила. Из нее делают струны для ракеток. - Как мило, - вздохнула. - Итак, твой диагноз? - потребовал. Сьюзан на минуту задумалась.

Peripheral device

Час сорок пять ночи. Он в недоумении посмотрел на двухцветного.

Глядя, как он шелестит деньгами, Меган вскрикнула и изменилась в лице, по-видимому ложно истолковав его намерения. Она испуганно посмотрела на вращающуюся дверь… как бы прикидывая расстояние. До выхода было метров тридцать. - Я оплачу тебе билет до дома, если… - Молчите, - сказала Меган с кривой улыбкой.

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