ウェブThe 74181 is a 7400 series medium-scale integration (MSI) TTL integrated circuit, containing the equivalent of 75 logic gates 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 .
ウェブALU= 算術論理ユニット(Arithmetic Logic Unit) 制御信号によって、どのような演算を行うかを決める組合せ回路. 例.74381(というIC)by TI. S0S1 S2. A. B. 例2.74181. A+B, A-B, A, B, A + B, A+1, A-1, A OR B, A AND B, 1111, 0000, A, B, ....... 出力.
ウェブThe 74181 is still used today in retro hacker projects. 1 The 74181 implements a 4-bit ALU providing 16 logic functions and 16 arithmetic functions, as the datasheet (below) shows. As well as the expected addition, subtraction, and Boolean operations, there are some bizarre functions such as "(A + B) PLUS A B ".