[pups] Disk query on Ultrix 3.1

Johnny Billquist bqt at update.uu.se
Sat Mar 24 08:43:20 AEST 2001

On Fri, 23 Mar 2001, Fred N. van Kempen wrote:

> Kevin,
> > Which disk should I tell the Ultrix installation I have to get the best
> from
> > my setup.  I made an 'educated' guess of RA81 for the moment, and that
> > works.
> Ultrix will think it is an RA81, most likely.  The controller will be seen
> as
> either an RQDX3 (MFM QBUS) or an UDA50 (MFM Unibus).  Never tried that, 'cos
> the
> controller is still on my "todo shelf".  Drives attached to either will
> report
> as RAxx'es... 

Actually, the UDA-50 isn't MFM, it's SDI. The QBUS equivalent is the

There is no MFM controller for Unibus. That is, no equivalent of the RQDXn
exists for Unibus.

Disks on the RQDXn reports as RDxx or RXxx, while disks on the [KU]DA-50
reports as RAxx (from a hardware point of view). They're both MSCP
controllers though.


Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt at update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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