Input devices Keyboards Mouse MICR (magnetic ink character reader) OCR (optical character reader) OMR (optical mark reader) Graphics Tablet Barcode readers Microphones

Input devices Keyboard Mouse A standard keyboard uses keys that stand for different characters that the computer recognises in its character set. The common keyboard is known as the QWERTY keyboard. But his design isn’t a very good design. Mouse A mouse is designed to be used as a pointer on the screen. It’s useful because it copies the way that humans point. A mouse is really two input devices one is the movement and the other is being able to select things. There are different types of mice for example the track ball used in many laptop computers.

Input devices MICR (magnetic ink character reader) These read characters that are printed on a document at the time when it is created. The character are printed using magnetic ink. The most common use for these is when printed on the bottom of cheques OCR (optical character reader) this is a device that reads characters and can distinguish between them. OCR is a unreliable form of input and works more effectively when it is restricted to having to recognise a standard set produced by printing rather then writing.

Input devices OMR (optical mark reader) Graphics tablet this device can recognise the presence of a mark on paper and where that mark is tells the machine the what information is there. Printing ion the sensitive areas of the paper is done with a special type of ink that the OMR can’t see. Which is why OMR documents are normally printed in pink or blue. School registers or multiply choice exams. Graphics tablet A graphics tablet is a flat surface on which a piece of paper is placed. The user can then draw on the piece of paper and the tablet will sense where the pencil is pointing and transfer the line to the screen.