Ethan Dicks wrote:
--- Carl Lowenstein <cdl(a)proxima.ucsd.edu>
wrote:
> From: Ethan Dicks
<erd_6502(a)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. :-(
Jerome Fine replies:
I have an RK05 drive - probably working, but no Qbus controller. I also
don't have enough time, but before I have to weed the patch of old
PDP-11 Qbus systems (I don't have any Unibus systems since they
are just too heavy), I want to transfer a number of old RT-11 distributions
to a hard disk drive and then to a CD.
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.
So DEC actually made a Qbus compatible controller for the RK05?
Looks like a 16-bit bus extender paddle card for the
Qbus end, plus
a strange bus interface in the controller box.
That long ago, DEC did many strange things.
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.
If necessary, you could add a bounce buffer to the device driver
to take care of the problem. I did this with the DYX.SYS
driver - worked very well.
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.
It is also possible to run a KDJ11 system with just 56 KBytes of RAM!
And with the KDJ11, it is usually possible (normally there are actually
64 KBytes of RAM, but the IOPAGE takes away 8 KBytes) if you have
the correct memory boards (like the M8044s) to reduce the IOPAGE
to 4 KBytes and then have 60 KBytes of memory.
As for running with RT11FB (or even RT11SJ which slows things down
too much), RT-11 will run Kermit very well in a 56 KByte memory
space. If you can copy the files to a SCSI hard drive, then the second
stage is a CD.
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.
Any idea where that might be.
I don't know if this request is reasonable, but anyone who can loan me
a Qbus RK05 controller can have the RK05 drive after I copy the
RK05 files to a SCSI hard drive. They can have the RK05 packs
as well.
Anyone want to consider this - or else just a loan of the Qbus controller?
I have a number of old RT-11 distributions that I want to copy to a CD
and make available to RT-11 hobby users. Since they are all prior to
V5.03 of RT-11, they can be made available under the same terms
as the present V5.03 distribution of RT-11.
Sincerely yours,
Jerome Fine
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