input and output devices pdf notes

Input And Output Devices Pdf Notes

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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.

Get top class preparation for UGC right from your home: Get detailed illustrated notes covering entire syllabus : point-by-point for high retention. A Computer is a General-purpose machine, commonly, accepts inputs , stores, manipulates, and generates outputs data as numbers, text, graphics, voice, video files, or electrical signals, in accordance with instructions called a program. This design is still used in most computers produced today.

The Input Devices are the hardware that is used to transfer transfers input to the computer. The data can be in the form of text, graphics, sound, and text. Output device display data from the memory of the computer. Output can be text, numeric data, line, polygon, and other objects. The most commonly used input device is a keyboard.

Notes on Input & Output Devices

Keyboard is the most common and very popular input device which helps to input data to the computer. The layout of the keyboard is like that of traditional typewriter, although there are some additional keys provided for performing additional functions. These keys include the letter keys A-Z and digit keys 09 which generally give the same layout as that of typewriters. It is used to enter the numeric data or cursor movement. Generally, it consists of a set of 17 keys that are laid out in the same configuration used by most adding machines and calculators. The twelve function keys are present on the keyboard which are arranged in a row at the top of the keyboard.

Chapter 9: Input-Output Devices

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Input Devices How to tell it what to do : This unit makes link between user and computer. The input devices translate the information into the form understandable by computer. Output Devices: How it shows you what it is doing Output devices translate the computer's output into the form understandable by users. It forms images from tiny dots, called pixels that are arranged in a rectangular form. The sharpness of the image depends upon the number of pixels. Printer: Printer is an output device, which is used to print information on paper.

Output Device can produce the final product of machine processing into a form usable by humans. It provides man to machine communication. Keyboard is most common input device is used today. The data and instructions are input by typing on the keyboard. The message typed on the keyboard reaches the memory unit of a computer. Apart from alphabet and numeral keys, it has other function keys for performing different functions.

Output Devices

The devices are usually used for display, projection, or for physical reproduction. Monitors and printers are two of the most commonly-known output devices used with a computer. A computer can still function without an output device.

Computer - Input Devices

Choose the correct option and mark your choice against the corresponding question number in the given answer sheet by darkening the corresponding circle with a lead pencil. Now they are also used with nonportable desktop computer systems because they occupy less table space. Non-impact printers.

Input and Output Devices of Computer

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Computer Fundamentals: Pradeep K. Sinha & Priti Sinha. Slide 4/ Chapter 9: Input-Output Devices. Ref Page. Role of I/O Devices. Input data from external.


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