Minecraft wiki entry for Logic_gates, associated text: The ALU shown below is a 1-bit ALU with the functions: ADD, AND, XOR. It takes the A and B inputs and then performs the selected functions. Read about the adders to see how the ADD function works. XOR and AND are basic functions that are explained on the logic circuits page. There can be more functions added to an ALU, like multiplication, division, OR, NAND... etc. These functions could, with some modifications, be added to this 1 bit ALU.