You mean like 'how do I terminate at the 'first' device in the chain?' - well, it's the last device as well, seen from the other side. You'll have to terminate it via option jumper, plug-in resistor array or a flat ribbon inline terminator.
Plus, as rkauer wrote, deactivate the Supra's terminaton since it's in the middle of the bus (thus the rule 'deactivate controller terminator when using both internal and external connectors').