Date: Thu, 25 Apr 2002 08:46:25 -0700 (PDT)
From: Ethan Dicks <erd_6502(a)yahoo.com>
Subject: Re: Anyone Care About RT-11
To: classiccmp(a)classiccmp.org
In-Reply-To: <3CC7778C.D5B157B3(a)compsys.to>
--- "Jerome H. Fine" <jhfinepw4z(a)compsys.to> wrote:
...I also acquired some RK05 packs with old RT-11
distributions that I
hope to make available as soon as I can find a controller for a Qbus
or someone with both a working RK05 and something more
recent such as an RL02. From the RL02, the final step is to
make copies available via a CD.
I have an RKV11D, numerous Qbus boxes and processors (this one came
attached to an 11/03, but I have lots of KDF11 stuff and one KDJ11
that I have yet to power on (it has a BA213 handle which I haven't
removed yet, and it does not fit into a BA11N or BA23 as-is). I
also have RLV11s and RLV12s and RL02 drives in close enough proximity
to be useful. I haven't fired up the RK05 in several years, so I'm not
sure about the state of the rubber parts, etc., but it's all accessible
and somewhat easy to reassemble. It worked the last time I used it.
I presume the RK11D does, but I wasn't sure how interchangable they
were fron a driver standpoint (Unibus and Qbus drivers can have issues
with mapping registers being handled differently, etc. Assumptions of
intercompatibility are unwise; we had completely different drivers for
our Unibus and Qbus products back in the old days).
The RKV11D is really an RK11D with a different bus interface.
Sort of a built-in Qniverter.
Unfortunately the designers skimped on the extended address bits,
so the RKV11 is 16-bit address space.
I think that hardware hacks to add two address bits to make the RKV11
compatible with the RK!1 have been published, but I don't remember where.
carl
--
carl lowenstein marine physical lab u.c. san diego
clowenstein(a)ucsd.edu