HP Model 743 PC Owner's Manual page 89

Table 4-6 AUI LAN Connector Pinouts
Pin Number
1 GND
2 CI-A
3 DO-A
4 DI-S (GND)
5 DI-A
6 GND
7 CO-A (NC)
8 CO-S (NC)
9 CI-B
10 DO-B
11 DO-S (GND)
12 DI-B
13 +12V
14 GND
15 CO-B (NC)
Signal
Connecting Cables
Network Connection
4-15