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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. The first modern computer. It had main
{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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