If you have pictures, that would be great.
I'll see what I can do.
I know that retro graphics boards were made for
multiple terminals.
It appears that the RG1000 is for ADDS terminals?
<http://books.google.com/books?id=Nb-pSr41croC&lpg=PA38&dq=retrographics&pg=PA38#v=onepage&q=retrographics&f=false>
It's been hard to assemble a coherent picture of the model numbers from
scattered things like Computerworld hits. The RG512 may have been
called something else in some of the supported terminals.
This RG1000 is in a tvi925.
De