74805 Hex 2-input NOR gates/line drivers. +----------+ +-----------+ ___ 1A |1 +--+ 20| VCC | A | B |/Y | /Y = A+B 1B |2 19| 6B |---+---+---| /1Y |3 18| 6A | 0 | 0 | 1 | 2A |4 17| /6Y | 0 | 1 | 0 | 2B |5 74 16| 5B | 1 | 0 | 0 | /2Y |6 805 15| 5A | 1 | 1 | 0 | 3A |7 14| /5Y +-----------+ 3B |8 13| 4B /3Y |9 12| 4A GND |10 11| /4Y +----------+ [This information is part of the GIICM]