7421 Dual 4-input AND gates. +----------+ +-------------------+ 1A |1 +--+ 14| VCC | A | B | C | D | Y | Y = ABCD 1B |2 13| 2D |---+---+---+---+---| |3 12| 2C | 0 | X | X | X | 0 | 1C |4 7421 11| | 1 | 0 | X | X | 0 | 1D |5 10| 2B | 1 | 1 | 0 | X | 0 | 1Y |6 9| 2A | 1 | 1 | 1 | 0 | 0 | GND |7 8| 2Y | 1 | 1 | 1 | 1 | 1 | +----------+ +-------------------+ [This information is part of the GIICM]