I am in the process of adding a TMA-11 tape controller with a TS03
tape drive to my PDP-11/10 system
which has a single RK05 drive attached. There no other devices attached.
I removed the Unibus terminator out of the RK05 and connected the BC11
Do you mean 'RK05' here? While the RK05s use Unibus cables and
terminators (M930), the signals are most certainly not Unibus.
The RK11 controller (may be an RK11-C or an RK11-D) has Unibus In and
Unibus Out connections and a connection of the cabel to the drive.
Assuming the RK11 is the last device on the Unibus, remove the M930 from
its Unibus Out slot, and plug a cable between there and the Unibus In
connector on the TMA-11
-tony