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Lexikon


IAS


1. er> The first modern computer. It had main ef="module.php?name=Lexikon&file=search&eid=1&query=registers">registers, processing circuits, information paths within the ef="module.php?name=Lexikon&file=search&eid=1&query=central processing unit">central processing unit, and used ef="module.php?name=Lexikon&file=search&eid=1&query=Von Neumann">Von Neumann' s ef="module.php?name=Lexikon&file=search&eid=1&query=fetch-execute cycle">fetch-execute cycle. The IAS machine' s basic unit of information was a 40-bit ef="module.php?name=Lexikon&file=search&eid=1&query=word">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 ef="module.php?name=Lexikon&file=search&eid=1&query=operation code">operation code and a 12-bit address that could identify any of 2^12 locations that may be used to store an ef="module.php?name=Lexikon&file=search&eid=1&query=operand">operand of the instruction. The ef="module.php?name=Lexikon&file=search&eid=1&query=CPU">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 ef="module.php?name=Lexikon&file=search&eid=1&query=registers">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. ef="module.php?name=Lexikon&file=search&eid=1&query=Immediate Access Storage">Immediate Access Storage. (2003-10-24)

e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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