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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. Many ...
ALU shift operations cause operand A (or B) to shift left or right (depending on the opcode) and the shifted operand appears at Y. Simple ALUs typically can shift the operand by only one bit position, whereas more complex ALUs employ barrel shifters that allow them to shift the operand by an arbitrary number of bits in one operation. In all ...
The 74181 ALU is the large IC center-right. As a demonstration of the power of their Micromatrix gate array technology, ... For operations requiring two operands, one ...
Some models of the DEC PDP-series 'minis' used the 74181 ALU as the main computing element in the CPU. Other examples were the Data General Nova series and Hewlett-Packard 21MX, 1000, and 3000 series. In 1965, typical quantity-one pricing for the SN5400 (military grade, in ceramic welded flat-pack) was around 22 USD. [19]
In the 1970s and 1980s, a number of research and commercial computers used bit slicing, in which the CPU's arithmetic logic unit (ALU) was built from multiple 4-bit-wide sections, each section including a chip such as an Am2901 or 74181. The Zilog Z80, although it is an 8-bit microprocessor, has a 4-bit ALU. [11] [12]
Applications such as Pinball take advantage of this to accelerate performance. The Alto has 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 128 (expandable to 512) KB of main memory organized in 16-bit words.
The SNC E-4C Survivable Airborne Operations Center (SAOC) is designed to incorporate advanced technologies that enhance its operational capabilities in various scenarios. One significant feature is its hardening against electromagnetic pulse (EMP) effects, which ensures that critical systems remain operational even after a nuclear event.
A CPU built using the 74181 will use more power and dissipate more heat than any modern microprocessor of equal computing power. A CPU built using the 74181 or even faster discrete logic families (like ECL) is limited by speed of light delays inherent in the size of the chips and the spacing between them. Believe it or not, part of the reason ...