Integrated Circuits Used 74LS153 Procedure Add IC 74LS153 into ICBase-2 (74LS153).Connect Pin-14 (Input) of ICBase-2 (74LS153) to Input-2.Connect Pin-2 (Input) of ICBase-2 (74LS153) to Input-1.Connect VCC Port to Pin-16 (Input) of ICBase-2 (74LS153).