Integrated Circuits Used 74LS08 Procedure Add IC 74LS08 into ICBase-1 (74LS08).Connect Pin-20 (Input & Output) of ICBase-3 to VCC Port.Connect Pin-20 (Input & Output) of ICBase-2 to VCC Port.Connect Pin-20 (VCC) of ICBase-1 (74LS08) to VCC Port.