Microcomputers are the most widely used computers made with microprocessors. A microcomputer is usually called a personal computer or PC because a person uses a computer. This type of computer has become very popular among the users as it is easy to carry , relatively inexpensive and easy to maintain. The use of such computers in personal , business , office , government , and above all non-application activities is increasing one after another. Examples of microcomputers like IBM PC, APPLE Macintosh etc.