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Manufacturer's data sheets: Texas Instruments (and 74182 look-ahead carry generator) Signetics; Philips; Fairchild. Explanation of how the chip works. Inside the vintage 74181 ALU chip: how it works and why it's so strange; Inside the 74181 ALU chip: die photos and reverse engineering showing its floorplan and transistor layout of some of its gates
Download as PDF; Printable version; ... "The 74181 is a bit slice arithmetic logic unit ... the signal "L" from figure 1 of the data sheet translates to logical one ...
4-bit arithmetic logic unit/function generator, generate and propagate outputs 20 SN74LS381A: 74x382 1 4-bit arithmetic logic unit/function generator, ripple carry and overflow outputs 20 SN74LS382: 74x383 1 8-bit register open-collector 20 SN74S383: 74x384 1 8-bit by 1-bit two's complement multipliers 16 SN74LS384: 74x385 4 quad serial adder ...
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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]
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Jason Day hits out of a green-side bunker on the 8th hole during the first round of the U.S. Open at Los Angeles Country Club. Pin placement green approaches.
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.