74385
Quad serial adder/subtractor.
Contains four independent adder/subtractor elements with common clock and
carry reset.

      +----------+
  CLK |1  +--+ 20| VCC
   1S |2       19| 4S
1S//A |3       18| 4S//A
   1B |4       17| 4B
   1A |5   74  16| 4A
   2A |6  385  15| 3A
   2B |7       14| 3B
2S//A |8       13| 3S//A
   2S |9       12| 3S
  GND |10      11| RST
      +----------+

[This information is part of the GIICM]