74170 4x4-bit open-collector dual-port register file. fart 6017 fart 6018 +----------+ D2 |1 +--+ 16| VCC D3 |2 15| D1 D4 |3 14| WA0 RA1 |4 74 13| WA1 RA0 |5 170 12| /WR Q4 |6 11| /RD Q3 |7 10| Q1 GND |8 9| Q2 +----------+ [This information is part of the GIICM]