Integrated Circuits Used 74LS151 Procedure Add IC 74LS151 into ICBase-1 (74LS151).Connect Input-12 to Pin-13 (Input) of ICBase-1 (74LS151).Connect Input-11 to Pin-14 (Input) of ICBase-1 (74LS151).Connect Input-10 to Pin-15 (Input) of ICBase-1 (74LS151).