Well, the guide says the following:
RJM02-AA(AD) : RM02 disk drive and controller to interface to the PDP-11
UNIBUS
RWM03-AA(AD) : Single-ported RM03 disk drive and controller to interface
to the
PDP-11/70 MASSBUS.
The description of both is almost the same, but it explicitly mentions
UNIBUS in the
RM02 text and MASSBUS in the RM03 text.
Oddly, the RM02 is not using the RH11 (Massbus interface for Unibus),
but is using
the RJM02 drive interface on the Unibus.
If the latter is Massbus, why then having 2 different interfaces? A DEC
quirk?
In any case, Henk and I may reconsider using a different type of
transportation
to get the 2 machines and 2 or 3 drives back home.....
Ed
Dave McGuire wrote:
>
> On April 6, The Wanderer wrote:
> > > I thought the only big difference between the RM02 and the RM03 was
> > > the spindle speed, though.
> >
> > Not entirely according to my copy of the systems & options summary
> > guide.
> > The RM02 canbe used with any PDP except the 11/70, while the RM03 is
> > only for the 11/70, as it has a massbus interface.
>
> Wait a minute...ALL RM02/03/05 drives are massbus. It is my (old and
> possibly erroneous) understanding that the RM03 was sold with the
> 11/70 in particular because it had a faster spindle speed, and as
> such, transferred data more quickly.
>
> What, specifically, does that Systmes & Options guide say about
> these drives?
>
> -Dave
>
> --
> Dave McGuire "I thought it would go quickly,
> St. Petersburg, FL that rubberized bottom..." -Sridhar
--
The Wanderer | Politici zijn gore oplichters.
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Received on Sat Apr 06 2002 - 07:28:57 BST