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The digital engineer today faces a number of new design challenges. In addition to the combinational and sequential logic circuits he may have been designing in past years, he must now deal with the design of small special-purpose computers based on large-scale integrated circuits. He will need to be familiar with programming techniques to some degree, since many of his circuits will use stored programs, possibly in read-only semiconductor memory storage. More than ever before, he needs to know the functional and operational differences between various forms of logic and memory circuits (TTL, MOS, CMOS, beam-lead, etc.), and how they can be powered and interfaced. He needs access to techniques for coding and error detection methods, as well as to other techniques for reliability and data security. He needs to know the Â¿tricksÂ¿ used in organization of large computers, for ultimately they seem to become important even in very small digital systems.