The LAN connections require some additional device drivers in order to communicate with the adapter.
Note: When PC/3270 is using a LAN Adapter, then that adapter cannot be used by any other program on this workstation. At this time there is no virtual IEEE 802.2 device driver available to allow adapter sharing, which means that PC/3270 will have exclusive use of this adapter when it is running.
We will set up PC/3270 to use a Token-Ring adapter. You could set it up to use Ethernet, PC Network or 3174 Peer (LAN over Coax) using the same technique.