AOS/VS. I don't know the whole Unix history at DG and I came in a bit later. But even when I joined in the mid-80s, I'm pretty sure there was a somewhat skunkworks Unix contingent (with both DG/UX and a hosted on AOS/VS MV/UX variant) which I'm pretty sure were running on MVs at the time. Not sure if the Unix folks were down in RTP in NC by then but there were definitely Unix fans among the OS group(s). DG didn't push Unix until later--it was just one of the things we offered--but I think there was probably more overt hostility from Ken Olsen at DEC.

(And I'm not sure Edson wouldn't have at least tacitly supported something at least in part because Olsen opposed it, even if DG did plenty of things patterned after DEC.)