7428
Quad 2-input NOR gates with buffered outputs.

    +----------+             +-----------+           ___
/1Y |1  +--+ 14| VCC         | A | B |/Y |      /Y = A+B
 1A |2       13| /4Y         |---+---+---|
 1B |3       12| 4B          | 0 | 0 | 1 |
/2Y |4  7428 11| 4A          | 0 | 1 | 0 |
 2A |5       10| /3Y         | 1 | 0 | 0 |
 2B |6        9| 3B          | 1 | 1 | 0 |
GND |7        8| 3A          +-----------+
    +----------+

[This information is part of the GIICM]