pdf input and output devices

Pdf input and output devices

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Chapter 9: Input-Output Devices

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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.

Chapter 9: Input-Output Devices

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.

From the human user 's perspective, the process of reading or seeing these representations is receiving output; this type of interaction between computers and humans is studied in the field of human—computer interaction. A further complication is that a device traditionally considered an input device, e. In computer architecture, the combination of the CPU and main memory , to which the CPU can read or write directly using individual instructions , is considered the brain of a computer.

Typically a CPU communicates with devices via a bus. The interface must have the necessary logic to interpret the device address generated by the processor.

If different data formats are being exchanged, the interface must be able to convert serial data to parallel form and vice versa. Because it would be a waste for a processor to be idle while it waits for data from an input device there must be provision for generating interrupts [2] and the corresponding type numbers for further processing by the processor if required.

For example, most operating systems provide application programs with the concept of files. The C standard library provides functions for manipulating streams for input and output. In the context of the ALGOL 68 programming language, the input and output facilities are collectively referred to as transput. This is similar to DMA, but more flexible. Typically one or more ports are assigned to the device, each with a special purpose.

The port numbers are in a separate address space from that used by normal instructions. Direct memory access DMA is a means for devices to transfer large chunks of data to and from memory independently of the CPU. From Wikipedia, the free encyclopedia. For uses of the term input-output in economics, see Input—output model. Communication between an information processing system and the outside world. This article needs additional citations for verification.

Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. The Essentials of Computer Organization and Architecture. Archived from the original on 20 December Retrieved 11 December Fundamentals of Computer Organization and Architecture. Archived from the original on 21 December Hidden categories: Articles with short description Short description matches Wikidata Articles needing additional references from November All articles needing additional references Wikipedia articles needing clarification from December Commons category link is on Wikidata.

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About Input And Output Devices Pdf

Show all documents Chapter-2 Input and Output Devices Speakers are one of the most common output devices used with computer systems. Some speakers are designed to work specifically with computers, while others can be hooked up to any type of sound system. Regardless of their design, the purpose of speakers is to produce audio output that can be heard by the listener. Virtual Reality — Opportunities and Challenges Virtual Reality is a technology based on computer which assimilates specialized input and output devices by allowing the user to interact with and experience an artificial created environment as if they were in the real world.

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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 and pxlcolor. Although these devices produce output which is not a raster, they still work in the same general fashion as all Ghostscript devices.

Computer input and output devices

This is the most important topic which you should prepare to score good marks. For this, your calculation speed and accuracy matters a lot. Improve your calculation by learning several short tricks and practice so many questions to ace the topic.

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Input devices are part of the four main hardware components of a computer system. The Image below shows where input dev ices fit into a computer system: There are many different kinds of input devices. They are split into two categories manual input devices and direct input devices. Manual Input devices: Data is input into the computer by hand.

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