Integrated Circuits Used 74LS83 Procedure Add IC 74LS83 into ICBase-1 (74LS83).Connect Input-3 to Pin-1 (Input) of ICBase-1 (74LS83).Connect Input-2 to Pin-3 (Input) of ICBase-1 (74LS83).Connect Input-1 to Pin-8 (Input) of ICBase-1 (74LS83).