Integrated Circuits Used 74LS02 Procedure Add IC 74LS02 into ICBase-1 (74LS02).Add IC 74LS02 into ICBase-2 (74LS02).Connect Input-9 to Pin-2 (Input) of ICBase-1 (74LS02).Connect Input-8 to Pin-3 (Input) of ICBase-1 (74LS02).