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Microprogram control has received a heavy design emphasis in several of the SYSTEM/BGO models because it makes an extensive instruction set economically feasible in relatively small computers. Microprogram control offers additional advantages for the designers of emulators and compatibility modifications. This paper reports on the main features of the microprogram design approach employed in SYSTEM/~GO. To help place the subject in perspective, some of the literature on microprogramming is briefly reviewed at the outset. The outlines of a microprogram language are also discussed.
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