Integrated Circuits Used 74LS83 Procedure Add IC 74LS83 into ICBase-1 (74LS83).Connect Pin-1 (Input) of ICBase-1 (74LS83) to Pin-6 (Output) of ICBase-1 (74LS83).Connect Pin-20 (Input) of ICBase-1 (74LS83) to Pin-10 (Input & Output) of ICBase-2.