4001

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Quad 2-input NOR gates

    +---+--+---+             +---+---*---+           ___
 1A |1  +--+ 14| VCC         | A | B |/Y |      /Y = A+B
 1B |2       13| 4B          +===+===*===+
/1Y |3       12| 4A          | 0 | 0 | 1 |
/2Y |4  4001 11| /4Y         | 0 | 1 | 0 |
 2A |5       10| /3Y         | 1 | 0 | 0 |
 2B |6        9| 3B          | 1 | 1 | 0 |
GND |7        8| 3A          +---+---*---+
    +----------+