First arithmetic logic unit (ALU) on a single chip
The 74S181 4-bit ALU bitslice resting on a page from the datasheet
The 74181 is a 4-bit slice arithmetic logic unit (ALU), implemented as a 7400 series TTL integrated circuit. Introduced by Texas Instruments in February 1970,[1] it was the first complete ALU on a single chip.[2] It was used as the arithmetic/logic core in the CPUs of many historically significant minicomputers and other devices.
The 74181 represents an evolutionary step between the CPUs of the 1960s, which were constructed using discrete logic gates, and today's single-chip microprocessor CPUs. Although no longer used in commercial products, the 74181 is still referenced in computer organization textbooks and technical papers. It is also sometimes used in "hands-on" college courses to train future computer architects.
^Höltgen, Stefan, ed. (2017). Logik, Informationstheorie [Logic, Information Theory] (in German). De Gruyter. p. 115. ISBN 9783110477504 – via Google Books.
^Daniel P. Sieworek; C. Gordon Bell; Allen Newell. "Chapter 6: Structure". Computer Structures: Principles and Examples(PDF). p. 63. The earliest and most famous chip, the 74181 arithmetic logic unit (ALU), provided up to 32 functions of two 4-bit variables.
The 74181 is a 4-bit slice arithmetic logic unit (ALU), implemented as a 7400 series TTL integrated circuit. Introduced by Texas Instruments in February...
implemented either as a stand-alone integrated circuit (IC), such as the 74181, or as part of a more complex IC. In the latter case, an ALU is typically...
a bit-slice arithmetic logic unit (ALU) based on the Texas Instruments 74181 chip, a ROM control store with a writable control store extension and has...
Instruments and Fairchild introduced 4-bit ALUs of their own in 1970, the 74181 and 9341, respectively. In contrast to the 8260, the new designs offered...
Conflict from 1854 to the Present Day. London: Carlton Books. ISBN 978-1-74181-342-5. Chapuis, Oscar (1995). A history of Vietnam: from Hong Bang to Tu...
the Mediterranean World, 1571-1640, New York University Press ISBN 0-814-74181-9. "Implementation of the Charter in Cyprus". Database for the European...
the Mediterranean World, 1571-1640, New York University Press ISBN 0-814-74181-9. "Turkish". Ethnologue. Archived from the original on 6 June 2019. Retrieved...
computers instead. The original 2200 processor board had discrete components, a 74181 ALU, 2703 ROMs and 2114 static RAM. This ran an instruction set indistinguishable...
Greek). Archived from the original on 2020-05-06. "Joint Ministerial Decree 74181/Δ2/2020 Government Gazette 2338/B/15-6-2020". Hellenic Parliament. E-Nomothesia...
arithmetic logic unit (ALU) was only 4-bits wide, implemented using a single 74181 IC. This meant it required four machine cycles to complete a 16-bit instruction...
and Waldo W. Primm (founding owners) Technical information Facility ID 74181 Class D Power 1,000 watts day 161 watts night Transmitter coordinates 35°26′28″N...
IP Other digital circuits (e.g. parity bit checker, multiplier) К155ИП3 74181 ИР IR Register, shift register К561ИР2 4015 ИС IS Full adder — — — 1ИС061А...
arithmetic logic unit (ALU) with 16 operations, functionally similar to the 74181 ten 4-bit registers: working register (accumulator), extended working register...
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