7425 Dual 4-input NOR gates with enable input. +----------+ __________ 1A |1 +--+ 14| VCC Y = G(A+B+C+D) 1B |2 13| 2D 1G |3 12| 2C 1C |4 7425 11| 2G 1D |5 10| 2B /1Y |6 9| 2A GND |7 8| /2Y +----------+ [This information is part of the GIICM]