4. Mainframe computers are data processing systems employed in mainly in large organizations for various applications Reference http://www.businessdictionary.com/definitio n/mainframe-computer.html http://www.businessdictionary.com/definitio n/mainframe-computer.html

6. Minicomputers have been stand-alone computers (computer systems with attached terminals and other devices) Reference http://search400.techtarget.com/definition/ minicomputer http://search400.techtarget.com/definition/ minicomputer

8. Microcomputers are "Microcomputer" is an antiquated term that refers to a computer that uses a microprocessor (integrated circuit) for its Central Processing Unit Reference http://www.wisegeek.com/what-are- microcomputers.htm http://www.wisegeek.com/what-are- microcomputers.htm