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Eval
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==Microcode== In 1966 [[IBM]] [[Conversational Programming System]] (CPS) introduced a [[Microcode|microprogrammed]] function <code>EVAL</code> to perform "interpretive evaluation of expressions which are written in a modified [[Polish notation|Polish-string notation]]" on an [[IBM System/360 Model 50]].<ref>{{cite web|last1=Allen-Babcock|title=Draft EVAL Microprogram|url=https://bitsavers.trailing-edge.com/pdf/allen-babcock/cps/Draft_Eval_Microprogram_Mar66.pdf|website=Bitsavers.org|access-date=January 17, 2016}}</ref> Microcoding this function was "substantially more" than five times faster compared to a program that interpreted an [[Assignment (computer science)|assignment]] statement.<ref>{{cite web|last1=Rochester|first1=Nathaniel|title=Conversational Programming System Progress Report|url=https://bitsavers.trailing-edge.com/pdf/allen-babcock/cps/CPS_Progress_Report_may66.pdf|website=Bitsavers.org|access-date=January 17, 2016}}</ref>
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