RKV11D vs RK11D (was Re: Anyone Care About RT-11)

From: Ethan Dicks <erd_6502_at_yahoo.com>
Date: Fri Apr 26 15:29:11 2002

--- Carl Lowenstein <cdl_at_proxima.ucsd.edu> wrote:
> > From: Ethan Dicks <erd_6502_at_yahoo.com>
> > I have an RKV11D...

I also happen to have an RK11C, but in 18 years, I have never managed
to hook it up and power it on. Got the prints, got spares, got drives,
etc. Don't got enough time. :-(

> The RKV11D is really an RK11D with a different bus interface.
> Sort of a built-in Qniverter.

That makes sense. The handle numbers on the boards in the controller
enclosure match the RK11D, so I figured that was what was going on.

Looks like a 16-bit bus extender paddle card for the Qbus end, plus
a strange bus interface in the controller box.

The IB11 is similar, but is a dual-height IVB11 (IEEE-488 interface,
standard equipment in a MINC) in a 4-slot, hex-height backplane with
a DEC bus perverter, meant to be mounted in a BA-11.

> Unfortunately the designers skimped on the extended address bits,
> so the RKV11 is 16-bit address space.

Not surprising. That seriously limits what I can do with it.

I may try to resurrect the 11/03 that this RKV11D came with, but I'd
be limited in what I could do with RT-11 at that point. Will Kermit-11
work for me if I only have 56KB of RAM? Is it possible to run a KDF11
CPU in a 16-bit-address environment? All I really want to do is make
physical backups of disk packs, etc., and get them to a CD burner.

> 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.

Ooh! I'd love to see it. I _do_ have some 22-bit bus extender cards/
cables (from a dual BA23 uVAX system)... so if the BC08 cables are
wired the same, I might be able to forego modding the Qbus end.

At this point, I may have to start digging into a couple of cabinets
I got last year that came with multiple RK05 drives - I haven't
completely gone over them, but I presume the RK controller is an RK11D.
At least, I didn't see an RK11C. Hard to miss... somewhat large. I
should get some pictures.

I might have to switch gears and go with an 11/34 or 11/24 for my
media rescue box. I should be able to accomodate DECtape I, DECtape II
(which I can already do with a PeeCee), RK05J (16-bit), RL01, RL02,
RX01 (not sure if I have an RX211) and 1600 bpi tape (TU-80, so no other


Do You Yahoo!?
Yahoo! Games - play chess, backgammon, pool and more
Received on Fri Apr 26 2002 - 15:29:11 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:34:34 BST