Input Devices of Computer

The keyboard:
The keyboard is the tool most often used for computer input. A computer keyboard is based on the old traditional QWERTY typewriter keyboard which includes the alphabet, numbers 0-9 and some basic punctuation, together with other keys (for example a space bar and a shift key, which allows a second s et of key features to be used, including the upper case alphabet keys).

Keying data into a computer using a keyboard can be a labour-intensive process. In many cases the process of inputting data is speeded up through some form of automated data capture.

Mouse:
In computing, a mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user’s hands, with one or more buttons. It sometimes features other elements, such as “wheels”, which allow the user to perform various system-dependent operations, or extra buttons or features

that can add more control or dimensional input. The mouse’s motion typically translates into the motion of a cursor on a display, which allows for fine control of a graphical user interface.

A computer mouse with the most common standard features: two buttons and a scroll wheel, which can also act as a third button

Magnetic ink character recognition (MICR):
Magnetic ink character recognition (MICR) involves the recognition by a machine of special formatted characters printed in magnetic ink. The characters are read using a specialised reading device. The main advantage of MICR is its speed and accuracy, but MICR documents are expensive to produce. The main commercial application of MICR is in the banking industry – on cheques and deposit slips.

Optical mark reading (OMR):
Optical mark reading involves the marking of a pre-printed form with a ballpoint pen or typed line or cross in an appropriate box. The card is then read by an OMR device which senses the mark in each box using an electric current and translates it into machine code. Applications in which OMR is used include National Lottery entry forms, and answer sheets for multiple choice questions.

Computer Input DevicesScanners and Optical Character Recognition (OCR):
A scanner is device that can read text or illustrations printed on paper and translate the information into a form the computer can use. To edit text read by a scanner, you need optical character recognition (OCR) software to translate the image into text.

Businesses may use a scanner and OCR to obtain ‘digital’ versions of documents they have only paper copies of. To enable the OCR software to recognise the characters correctly, the paper copy of the document must be good quality.

Bar coding and EPOS:  
Bar codes are groups of marks which, by their spacing and thickness, indicate specific codes or values. Electronic Point of Sale (EPOS) devices, which include bar code readers, enable supermarkets and other retailers to record and manage inventory movements – and provide detailed sales information.

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