74183 Dual full adder. +----------+ +-------------------+ 1A |1 +--+ 14| VCC | CI| A | B | S | CO| |2 13| 2A |---+---+---+---+---| 1B |3 74 12| 2B | 0 | 0 | 0 | 0 | 0 | 1CI |4 183 11| 2CI | 0 | 0 | 1 | 1 | 0 | 1CO |5 10| 2CO | 0 | 1 | 0 | 1 | 0 | 1S |6 9| | 0 | 1 | 1 | 0 | 1 | GND |7 8| 2S | 1 | 0 | 0 | 1 | 0 | +----------+ | 1 | 0 | 1 | 0 | 1 | | 1 | 1 | 0 | 0 | 1 | | 1 | 1 | 1 | 1 | 1 | +-------------------+ [This information is part of the GIICM]