74242 4-bit 3-state inverting bus transceiver. Two enable pins control output enables, one active high and one active low. +----------+ /GAB |1 +--+ 14| VCC |2 13| GBA A1 |3 74 12| A2 |4 242 11| B1 A3 |5 10| B2 A4 |6 9| B3 GND |7 8| B4 +----------+ [This information is part of the GIICM]