The “GRC TBC” is a bootstrap and terminator board designed for PDP-11 QBUS systems.
The manufacturer is General Robotics Corporation.
The TBC provides the following functionality:
- Termination for QBUS backplane signals
- On-board EPROMs (for bootstrap or other purposes)
- Support for front-panel functionality (run status indicator, enable/halt switch and LTC switch)
- Capability to generate LTC signal from external AC transformer
According to the User’s Manual, GRC made available a range of bootstrap EPROMs for this board (including support for RX02 and RL drives). I have one set of EPROMs for this board. I don’t yet know which device these support, but I have inserted links to them below.
I have also found the following documentation (which appears likely to be earlier than the Users Manual mentioned above):