@melott-
In addition to all that N7VQM said... I'd like to chime in with a little knowledge of the Retina Z2 card. It's a very old card... Created back before the idea of RTG had really been thought about. Hardware was also very expensive back then, and as such, some corners were cut with this card. It uses some very strange addressing modes. This means, an already difficult task of writing a low-level device driver is that much harder because it's a low-level driver to interface with outdated, strange, and poorly documented hardware.
The team for CyberGraphX have attempted to support the Retina Z2 several times (and have been met with very limited success, as I understand) and these are the people with the very best qualifications to do something like that. If you really insist on giving this a run, I'd recommend getting proficient with C/C++ and Amiga assembler. You'll need it. Then, contact the CyberGraphX team, and see if they even think it's POSSIBLE to support the hardware in any useful form, and ask for any notes on it they might have. You'll need them. This is a LOT bigger project than you are imagining.
