Integrated Circuits Used 74LS83 Procedure Add IC 74LS83 into ICBase-1 (74LS83).Add IC 74LS83 into ICBase-2 (74LS83).Connect GND Port to Pin-8 (Input) of ICBase-1 (74LS83).Connect VCC Port to Pin-20 (Input) of ICBase-1 (74LS83).