Input devices of computer pdf


Input Devices. Keyboard. • One of the primary input devices used with a computer . • The keyboard looks very similar to the keyboards of electric typewriters, with. Input Devices. Input devices are hardware devices that allow data to be entered into a computer. Input devices are part of the four main hardware. PDF | Shumin Zhai and others published The Computer Mouse and Related Input Devices.

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Input Devices Of Computer Pdf

Keyboard is the most common and very popular input device which helps in inputting data to the computer. The layout of the keyboard is like that of traditional . Computer Input Devices - Learn computer fundamental concepts in simple and easy steps starting from Overview, Applications, Generations, Types. The computer will be of no use unless it is able to communicate with the outside world. Input/Output devices are required for users to communicate with the.

Moves the cursor faster than the arrow keys of the keyboard. Joystick Joystick is also a pointing device, which is used to move the position of the cursor on a computer screen. It looks like a stick with a spherical ball at its both lower and upper ends. The lower spherical ball moves in a socket, it is adjusted in the socket itself. The joystick can be moved in all four directions. The function of the joystick is similar to that of a mouse.

Digitizer is also known as Tablet or Graphics Tablet as it converts graphics and pictorial data into binary inputs. A graphic tablet as digitizer is used for fine works of drawing and image manipulation applications. Microphone Microphone is an input device to input sound that is then stored in a digital form.

The microphone is used for various applications such as adding sound to a multimedia presentation or for mixing music. The bank's code number and cheque number are printed on the cheques with a special type of ink that contains particles of magnetic material that are machine readable.

The main advantages of MICR is that it is fast and less error prone.

OCR scans the text optically, character by character, converts them into a machine readable code, and stores the text on the system memory. Bar Code Readers Bar Code Reader is a device used for reading bar coded data data in the form of light and dark lines. Bar coded data is generally used in labelling goods, numbering the books, etc.

It may be a handheld scanner or may be embedded in a stationary scanner. Bar Code Reader scans a bar code image, converts it into an alphanumeric value, which is then fed to the computer that the bar code reader is connected to.

It is used where one out of a few alternatives is to be selected and marked. It is specially used for checking the answer sheets of examinations having multiple choice questions.

Output Device Following are some of the important output devices used in a computer. It forms images from tiny dots, called pixels that are arranged in a rectangular form. Apart from alphabet and numeral keys, it has other function keys for performing different functions.

The mouse is rolled over the mouse pad, which in turn controls the movement of the cursor in the screen. We can click, double click or drag the mouse. The ball has 2 wheels of the sides, which in turn mousse with the movement of the ball. This device works like a Xerox machine.

The scanner converts any type of printed or written information including photographs into digital pulses, which can be manipulated by the computer.


The user moves the ball directly, while the device itself remains stationary. The user spins the ball in various directions to effect the screen movements. First Generation Vacuum Tubes The first computers used vacuum tubes for circuitry and magnetic drums for memory.

Second Generation Transistors Transistors replaced vacuum tubes and ushered in the second generation of computers. They were very expensive to operate and in addition to using a great deal of electricity. First generation computers relied on machine language.

Input device

Input was based on punched cards and paper tape. Though the transistor still generated a great deal of heat that subjected the computer to damage.

The transistor was far superior to the vacuum tube. Instead of punched cards and printouts. Second-generation computers still relied on punched cards for input and printouts for output. Third Generation Integrated Circuits The development of the integrated circuit was the hallmark of the third miniaturized generation and of computers. Flag for inappropriate content. Related titles. Initiating Price Increases and Responding to competitors' price increases. Jump to Page. Search inside document.

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