7405 Hex open-collector inverters. +----------+ +-------+ _ 1A |1 +--+ 14| VCC | A |/Y | /Y = A /1Y |2 13| 6A |---+---| 2A |3 12| /6Y | 0 | Z | /2Y |4 7405 11| 5A | 1 | 0 | 3A |5 10| /5Y +-------+ /3Y |6 9| 4A GND |7 8| /4Y +----------+ [This information is part of the GIICM]