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IAS Pathopoeia \Path`o*poe"ia\, n.; pl. {-ias}. [NL., from Gr. paqopoii`:a; pa`qos passion poiei^n to make.] (Rhet.) A speech, or figure of speech, designed to move the passion. --Smart. [1913 Webster] 1. {registers}, processing circuits, information paths within the {central processing unit}, and used {Von Neumann}'s {fetch-execute cycle}. The IAS machine's basic unit of information was a 40-bit {word} and the memory had 4096 words. A word stored in memory could represent either an instruction or data. Each IAS instruction was twenty bits long, so that two instructions could be stored in each 40-bit memory location. Each instruction consisted of an 8-bit {operation code} and a 12-bit address that could identify any of 2^12 locations that may be used to store an {operand} of the instruction. The {CPU} consisted of a data processing unit and a program control unit. It contained various processing and control circuits along with a set of high-speed {registers} for the temporary storage of instructions, memory addresses, and data. The main actions specified by instructions were performed by the arithmetic-logic circuits of the data processing unit. An electronic clock circuit was used to generate the signals needed to synchronise the operation of the different parts of the system. [Who? Where? When? Implemented using what?] 2. {Immediate Access Storage}. (2003-10-24)
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