On 10/4/2017 3:33 PM, Dominique Carlier via cctech wrote:
> Hi all
> I start here another topic concerning my research about a new Operating
> System for my freshly restored DCC-116 E.
> I originally intended to install RDOS on my machine but it seems very
> difficult to find the files needed to make a system installation tape.
FIRST: If you have drawings for the DCC, please let me know. I have
two of them (long in storage in the house, but they ran when I pulled
them from their Unitote/Regitel rack a couple of *decades* ago.
There is an RDOS - disk images, available at:
(Top entry in the list) It is about a 2.5MB disk image.
I suggest that you might download SimH and that image, configure SimH as
a straight Nova (rather than a /3 or /4) and see if it runs that image
OK. If so, there you go!
Beyond that, I *might* be able to help, but it will depend on what the
status of copyright is on what I have, and whether your system can even
run what I do have. I am looking into the copyright part of it - that
may take a week or two. (This is something I needed to to anyway).
In the meantime:
Do you have a way to *write* a tape image? I have an AWS format image
of an RDOS starter system. Note, however, that the label on the RDOS
starter image I have suggests it may only be appropriate for a NOVA 3
or NOVA 4, so it might not run on your system. So, I'd have to take
some time to boot it and try and set up a system for a straight Nova.
As this would take several hours, I'm not keen on doing that unless you
know that one from SimH will not work for you.
I also have some OS and compiler DG floppy images, if you have a
DG-compatible floppy setup. Several different operating systems there.
Same issue: one would have to see how many are compatible with a
straight Nova. I have images of the floppies.
Diagnostics for DG systems are notoriously difficult to find. I have a
few, in listing format.
A few months ago, I mentioned one of my suppliers had Belden 89880 thicknet
Ethernet cable. Well, last week I finally made it down to his warehouse and
picked it up! The final bits for a test segment came in today, so I set up
a little link between my SPARCstation 10 and DEChub 90:
Anyone interested in cable can email me directly (please change the subject
line, it'll get binned into my cctalk folder otherwise). I can provide any
level of "kit" from just the cable to fully ready to go. I do have a very
few NOS Cabletron ST-500-01 transceiver/non-intrusive tap kits as well.
Collected stuff for over 10 years. Moving from 2300 sq. ft. to 1400. It
had to go. Praise the computer gods I found someone that wanted it all.
115 boxes of manuals and documents.
26 boxes of coffee mugs
73 703 boxes of stuff.
106 loose big items.
Filled the floor space of a 26' truck.
It can be viewed at http://www.ibmjunkman.com/junk/
Best viewed on a PC with decent speed connection.
Sample stuff: 360 Mod 20 panel, mod 30 panel, mod 65 panel, s/3 panel. Disk
pack and HDA up the ying yang. 3850 data carts, 2321 data cell, 7340
Hypertape cartridge, a Russian equivalent, desktop chachki (tchotchke), 360
mod 70 desktop model used in 1964 World's Fair, etc, etc.
A couple of boards from an unknown computer came in and i am trying to get
them to a good home and not be scrapped. I was curious if anyone here knew
what they were out of. They were in the box with some small core memory
boards. If someone here wants to make an offer ill gladly take the ebay
> From: Paul Koning
> I believe the original concept was just a probe that would poke through
> the cable to contact the center connector. The drill came because the
> cable was too tough to penetrate without it.
No, the original 3 Mbit Ethernet also used a 'drill' (actually, a cylindrical
cutter which screwed into the thread of the tap housing; threading which was
then used to screw in the transceiver).
Anyway, there has to be a hole cut _through_ the cylindrical ground layer
(foil, or woven wire) around the center conductor. If you just stuck a probe
into the cable to the center conductor, it would short it out.
On Thu, Jun 28, 2018 at 8:26 PM, Bill Degnan via cctech <
cctech at classiccmp.org> wrote:
> I have always pointed my grant continuity cards in the same direction as a
> NPG card, with the traces to the left/facing the last slot of the
> backplane. I am 99% sure this is right but I was asked and I just want to
> be 100%...am I right? In particular the traces point away from the CPU
> cards, at least on an 11/40 and 11/05. Please just tell me I am not losing
If your system works properly, the grant cards are in the right way. If the
grant cards are installed wrong, or missing, it will cause serious
problems, and you're unlikely to be able to boot anything.