jkunz@unixag-kl.fh-kl.de wrote:
> 
> On 27 May, James Lothian wrote:
> 
> > Some of the third party RX02 emulators used more standard setups,
> > though, and worked with standard drives, so you might have more luck
> > there.
> It is no original DEC RXV21. It is a third paty product, "MXV21" made by
> "MDA". There is all the stuff on it to make it a complete controller.
> Read/write circuit, 2 x AM2901 with all the AM29xx stuff around it,
> TMS4044 SRAM, ... It has the usual 50 pin connector for 8" floppy
> drives. If I plug it into one of my QBus VAXen it is shown as RXV21 by
> the "show qbus" command.
> --
> 
> tsch,
>          Jochen
> 
> Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/

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.

James