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Input & output devices Overlay Keyboards In many applications only a small number of different entries need to be made. It is faster to press a marked key than to enter a string of data. You are also less likely to make mistakes. The overlay keyboards works by having a membrane keyboard that has a number of areas/ keys on it. An overlay is put on top of the keyboard so that the user can select a specific for a particular entry. The computer is programmed to respond to each key in an appropriate manner. Touch Screens In some applications the concept keyboard application is replaced by a touch sensitive screen. The user touches the screen and the computer is programmed to respond in an appropriate way. One advantage of this method is that the program can change the screen layout at any time, and is possible to have several different menus (a bit like...

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