1. The first moderN computer. It had maiNregisters, processiNg circuits, iNformatioN paths withiN the ceNtral processiNg uNit, aNd used VoNNeumaNN' 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 aNoperaNd 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)
