> On 28 May, James Lothian wrote:
> 
> > Ah. For the MXV21, formatting works the same as media density
> > setting, except that the keyword you load into the data buffer
> > register is 222 (octal) instead of 111. The format operation
> > automatically does a set media density as well.
> BINGO!
> >>>d/p/w 20001E78 109
> >>>d/p/w 20001E7A 92
> And the controller starts to format the medium. 
> 
Great! Half done! Congratulations!

> 
> OK. The first step towards rx(4) is done.
> ?! There is already a rx(4)!? It seems to be a residuum from long gone
> 4.2BSD days. [looking at the 4.2BSD source] Indeed, there is a
> src/sys/vaxuba/rx.c, without copyright notice...
> 
There is a clash in device naming, rx is RX33/RX50 on MicroVAXen.
I would call it "rf" for the floppy station and "rfc" for their
controller.