Integrated Circuits Used 74LS02 Procedure Add IC 74LS02 into ICBase-2 (74LS02).Connect Pin-7 (Ground) of ICBase-2 (74LS02) to Input-12.Connect Pin-3 (Input) of ICBase-2 (74LS02) to Input-11.Connect Pin-6 (Input) of ICBase-2 (74LS02) to Input-10.