74258 8-to-4 line 3-state inverting data selector/multiplexer. +----------+ S |1 +--+ 16| VCC 1A0 |2 15| /EN 1A1 |3 14| 4A0 /1Y |4 74 13| 4A1 2A0 |5 258 12| /4Y 2A1 |6 11| 3A0 /2Y |7 10| 3A1 GND |8 9| /3Y +----------+ [This information is part of the GIICM]