7411027 Triple 3-input NOR gates with buffered output. +----------+ +---------------+ _____ 1A |1 +--+ 16| 1B | A | B | C |/Y | /Y = A+B+C /1Y |2 15| 1C |---+---+---+---| /2Y |3 14| 2A | 0 | 0 | 0 | 1 | GND |4 7411 13| VCC | 0 | 0 | 1 | 0 | GND |5 027 12| VCC | 0 | 1 | X | 0 | /3Y |6 11| 2B | 1 | X | X | 0 | 3C |7 10| 2C +---------------+ 3B |8 9| 3A +----------+ [This information is part of the GIICM]