DSD-440 software

[Tony Duell]

> > 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