Integrated Circuits Used 74LS00 Procedure Connect Input-15 to Pin-2 (Input) of ICBase-1 (74LS00).Connect Input-14 to Pin-3 (Output) of ICBase-1 (74LS00).Add IC 74LS00 into ICBase-2 (74LS00).Add IC 74LS00 into ICBase-1 (74LS00).