4002, 744002 Dual 4-input NOR gates. +----------+ +-------------------+ _________ /1Y |1 +--+ 14| VCC | A | B | C | D |/Y | /Y = (A+B+C+D) 1A |2 13| /2Y |---+---+---+---+---| 1B |3 12| 2D | 0 | 0 | 0 | 0 | 1 | 1C |4 4002 11| 2C | 0 | 0 | 0 | 1 | 0 | 1D |5 10| 2B | 0 | 0 | 1 | X | 0 | |6 9| 2A | 0 | 1 | X | X | 0 | GND |7 8| | 1 | X | X | X | 0 | +----------+ +-------------------+ [This information is part of the GIICM]