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The 74181 is a 7400 series medium-scale integration (MSI) TTL integrated circuit, containing the equivalent of 75 logic gates [3] and most commonly packaged as a 24-pin DIP. The 4-bit wide ALU can perform all the traditional add / subtract / decrement operations with or without carry, as well as AND / NAND, OR / NOR, XOR , and shift .
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The Xerox Alto is a computer system developed at Xerox PARC (Palo Alto Research Center) in the 1970s. It is considered one of the first workstations or personal computers, and its development pioneered many aspects of modern computing.
In computing, an arithmetic logic unit (ALU) is a combinational digital circuit that performs arithmetic and bitwise operations on integer binary numbers. [1] [2] This is in contrast to a floating-point unit (FPU), which operates on floating point numbers.
A fact from 74181 appeared on Wikipedia's Main Page in the Did you know column on 3 November 2007. The text of the entry was as follows: The text of the entry was as follows: Did you know ... that the 74181 chip (pictured) greatly simplified the development and manufacture of computers during the late 1960s and 1970s?
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The 74181 ALU is the large IC center-right. As a demonstration of the power of their Micromatrix gate array technology, in 1968 Fairchild prototyped the 4711, a single-chip 4-bit ALU. [ 10 ] [ 21 ] The design was never intended for mass production and was quite expensive to produce.
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