Integrated Circuits Used 74LS151 Procedure Add IC 74LS151 into ICBase-1 (74LS151).Connect VCC Port to Pin-19 (Input) of ICBase-1 (74LS151).Connect Pin-1 (Input) of ICBase-1 (74LS151) to VCC Port.Connect VCC Port to Pin-4 (Input) of ICBase-1 (74LS151).