The RXV21
clone controller I have in my primary 11/23+ system (an MXV21
made by MDA) allows simple formatting by poking a couple values into the
right registers. It works great. A few minutes of coding would result in
a SAV program that does it for you with prompts.
Uhh, I have a couple of Qbus cards by MDA that I've never identified.
Got pics?
Msot of these RX02-compatible controllers had a single 50 pin header
(normal SA800 drive bus), and 3 40 pin chips (2 off 2901, 1 off 2910) on
them (with other parts too, of course).
-tony