Its principal role is not the transformation of data, but rather the interaction with the physical world. It executes on machines that are not, first and foremost, computers. They are cars, airplanes, telephones, audio equipment, robots, appliances, toys, security systems, pacemakers, heart monitors, weapons, television sets, printers, scanners, climate control systems, manufacturing systems, and so on.
Reference: Embedded Software. Edward A. Lee, eal@eecs.berkeley.edu. To appear in Advances in Computers (M. Zelkowitz, editor), Vol. 56, Academic Press, London, 2002 Revised from UCB ERL Memorandum M01/26. University of California, Berkeley, CA 94720, USA. November 1, 2001.
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