[Simh] PDP-10 simulator with DMR/KDP support?

Fri Jun 7 15:45:49 EDT 2013

I believe that the DUP11 emulation is working.  It has been tested minimally on RSX11M+ talking to RSX11M+.  Never having been a user of these systems I don't have enough experience to do rigorous testing.  Anyone willing to test more rigorously is welcome.

In theory, the DUP11 could work for VAX Unibus systems, however I don't think the DUP11 was ever a supported device on VMS.  Maybe for DECnet Phase V, but I can't seem to find support prior to that.  Even in the DECnet Phase V case, the DUP11 smiulation ONLY supports DDCMP on the wire and I don't know if that was what DECnet Phase V spoke on the wire...  I welcome anyone with the experience to test.  Contact me offline for specific help.

The current code at github.com/simh/simh (downloadable as https://github.com/simh/simh/archive/master.zip) will build PDP11 and all the Unibus VAX simulators with DUP11 support.  If DDCMP on DUP11's was never a supported protocol for VMS, we'll probably remove the DUP from the VAX simulators before things settle down.

As Rob and Tim have said, the KDP is still a work in progress.  The ultimate goal will be to have the KDP talk to other KDP's and bare DUP11's and the DMC11 all speaking DDCMP on the wire.

The original KDP code spoke partial DDCMP on the wire (without DDCMP's CRC's) and as Tim mentions below, had numerous issues with some required OS interactions as well as correct observance of DDCMP's packet boundaries in the data stream.

Rob's DMC11 implementation didn't speak DDCMP on the wire at all.

So work is ongoing to get each of these devices to talk a common language and to meet OS expectations..

-          Mark

From: simh-bounces at trailing-edge.com [mailto:simh-bounces at trailing-edge.com] On Behalf Of Timothe Litt
Sent: Friday, June 07, 2013 11:29 AM
To: simh at trailing-edge.com
Subject: Re: [Simh] PDP-10 simulator with DMR/KDP support?

I've decided to try my hand at building a TOPS-10 with DECnet on a KS10/simh.  I followed a lot of the discussion of this a couple of months ago, but I'm not sure where it all ended.  Can anybody point me to a copy of the PDP10 simh with the latest DMR/KDP support?
Here's what I know:

Rob Jarrett ported a KDP simulation to the latest emulator.  It didn't quite work.  There's a personal repo on github, but it's not worth a pointer.

I have 2 -10s and 2 -20s  configured for DECnet (and ANF-10) running on my desktop. (!)  No 11-based ANF nodes yet.

I made some progress - I had ANF-10 up for an hour or so; DECnet-10 not at all; DECnet-20 sometimes.  The KDP emulation is missing some commands that the OSs count on.  My code isn't in the repo, yet.

Mark Pizzolato has a DUP emulation that he says is mostly working on 11s and VMS.  Rather than keep two DUP emulations, the plan was to split the KDP into the KMC + DUP, rather like the real hardware.

I've been off line for about the past 10 daze - e-mail appears and disappears on my servers - the responsible party calls it an 'upgrade', so I'm not sure what the current state pf the KDP/DMR work is.

I have tracked down the COMIOP-DUP microcode USER's documentation with the help of Al Kossow and Cynde Moya, and it's on bitsavers along with the DMR tech manuals.  (Both even agree with my memory.)

http://bitsavers.org/pdf/dec/unibus/AA-5670A-TC_COMM_IOP-DUP_Programming_Manual_Jan78.pdf and http://bitsavers.trailing-edge.com/pdf/dec/unibus/EK-DMR11-TM-002_Jan81.pdf; also  http://bitsavers.trailing-edge.com/pdf/dec/unibus/EK-DMR11-UG-002_DMR11_Synchronous_Controller_Users_Guide_Dec80.pdf

Once I catch up on e-mail, I'll see what I can do to help, depending on where Mark and Rob are.  (They may have given up on me  due to my on/off (mostly off) mail service.  Hopefully that's fixed.)

I have 2,475 e-mail messages to sort thru before I'm up-to-date...but should have some time this weekend.  I hope.

This communication may not represent my employer's views,

if any, on the matters discussed.
On 07-Jun-13 13:36, Bob Armstrong wrote:
  I've decided to try my hand at building a TOPS-10 with DECnet on a KS10/simh.  I followed a lot of the discussion of this a couple of months ago, but I'm not sure where it all ended.  Can anybody point me to a copy of the PDP10 simh with the latest DMR/KDP support?

Thanks,
Bob Armstrong

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