Integrated Circuits Used 74LS76 74LS20 Procedure Add IC 74LS76 into ICBase-1 (74LS76).Add IC 74LS76 into ICBase-2 (74LS76).Add IC 74LS76 into ICBase-3 (74LS76).Add IC 74LS76 into ICBase-4 (74LS76).Add IC 74LS20 into ICBase-5 (74LS20).