(74181) SN74LS181N 4-bit ALU

Description

SN74LS181N – 4-bit slice arithmetic logic unit (ALU), implemented as a 7400 series TTL integrated circuit.

https://en.wikipedia.org/wiki/74181

Datasheet:  74181_Philips

Nibbler computer board: Nibbler 4 Bit CPU Big Mess o’ Wires