Integrated Circuits Used 74LS03 74LS04 74LS05 74LS02 Procedure Add IC 74LS03 into ICBase-3 (74LS03).Add IC 74LS04 into ICBase-4 (74LS04).Add IC 74LS05 into ICBase-5 (74LS05).Add IC 74LS02 into ICBase-2 (74LS02).