Integrated Circuits Used 74LS191 74LS86 Procedure Add IC 74LS191 into ICBase-1 (74LS191).Add IC 74LS86 into ICBase-2 (74LS86).Connect Input-0 to Pin-5 (Input) of ICBase-1 (74LS191).Connect Input-1 to Pin-18 (Input) of ICBase-1 (74LS191).