... only memory) non-volatile, data isn't lost when the computer is switched off, and is used to store system software. INPUT DEVICES Input devices allow data to be inputted in to the computer system. This can be done by hand e.g. keyboard or by using automated input devices, which allow automated data entry. KEYBOARD- Input device to allow the user to type charters into the computer system e.g. codes. These have a wide variety of applications. Some however aren't suitable for the task. Overlay keyboards are used in shops, where a key represents a code or a department code; obviously the key is labelled for the operator. Keyboards are flat and easy clean; this makes it easier for the application e.g. fast food restraints. TOUCH SCREEN- Mainly used in fast food shops. Where the user selects an item, the computer detects this and the main computer accepts the code of the item. Advantages) can be ...

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