74651 8-bit 3-state inverting registered transceiver. +----------+ CAB |1 +--+ 24| VCC SAB |2 23| CBA GAB |3 22| SBA A1 |4 21| /GBA A2 |5 20| B1 A3 |6 74 19| B2 A4 |7 651 18| B3 A5 |8 17| B4 A6 |9 16| B5 A7 |10 15| B6 A8 |11 14| B7 GND |12 13| B8 +----------+ [This information is part of the GIICM]