Integrated Circuits Used 74HC191 Procedure Add IC 74HC191 into ICBase-2 (74HC191).Connect VCC Port to Pin-16 (Output) of ICBase-2 (74HC191).Connect Pin-8 (Ground) of ICBase-2 (74HC191) to GND Port.Connect GND Port to Pin-4 (Input) of ICBase-2 (74HC191).