Copyright (c) 2004 IEEE. Reprinted from IEEE Spectrum, vol...

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Copyright (c) 2004 IEEE. Reprinted from IEEE Spectrum, vol. 7, pp. 63-68, July 1970. This material is posted here with permission of the IEEE. Such permission ofthe IEEE does not in any way imply IEEEendorsement of any of the products or services of the University of North Carolina at Chapel Hill. Internal or personal use of this material is permitted. However,permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resaleor redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyrightlaws protecting it.