Integrated Circuits Used 74HC191 74LS08 Procedure Add IC 74HC191 into ICBase-2 (74HC191).Add IC 74LS08 into ICBase-3 (74LS08).Connect GND Port to Pin-8 (Ground) of ICBase-2 (74HC191).Connect VCC Port to Pin-20 (VCC) of ICBase-2 (74HC191).