[Simh] [HECnet] TOPS-20 V4.1 DECnet

Fri May 2 19:02:12 PDT 2014

Hi guys,

what you propose will not work.

I already connected a Tops20 4.1 with a phase-III Tops10 Pdp10 and even that
will not work.
Tops20-4.1 to a clone does as well as a Pdp10 phase-III to a clone does.
Tim Litt mentioned a while ago that Tops20 4.1 was rather more of a phase-II
then a III; I call it phase-II+ as it appears to have some routing
functionality.
So it will certainly not work with Rsts-E 10.1L and Rsx11MP46 as all these
are phase-IV.
Further there is no difference between the functioning of a Rsts-E 10.1 and
a Rsx11MP46 Pdp11 with respect to Dup/Dmc/Ethernet if Rsts-E will support
the Dup/Dmc lines and will route as it is primarily an Ethernet system. 

To make these things work the following has to be done:
1.	Upgrade Tops20-4.1 Decnet to real phase-III, it then will link to a
Pdp10 Tops10 7.02 based phase-III router.
2.	Repair/upgrade the Tops10 7.02 router code so that it will talk to a
phase-IV node.

Both things will require Tops monitor programming; the Tops10 7.02 case will
probably be the most simple of the two.
On the physical plane nothing is wrong as the packets do flow; only the
DDCMP communication process will not startup; it hangs around in the startup
phase.

Best regards

Reindert

-----Original Message-----
From: simh-bounces at trailing-edge.com [mailto:simh-bounces at trailing-edge.com]
On Behalf Of Cory Smelosky
Sent: Friday, May 02, 2014 19:31
To: hecnet at Update.UU.SE
Cc: simh at trailing-edge.com
Subject: Re: [Simh] [HECnet] TOPS-20 V4.1 DECnet

On Fri, 2 May 2014, Paul_Koning at Dell.com wrote:

On May 2, 2014, at 12:59 PM, Mark Pizzolato - Info Comm
<Mark at infocomm.com> wrote:

On Friday, May 02, 2014 at 7:36 AM, Paul Koning wrote:
...If you want a RSTS system to connect to your Phase III machine, 
you'll want to use a DMC (or DMR/DMP/DMV, they are all roughly 
interchangeable).   In a sufficiently recent SIMH, the DMC emulation 
speaks real DDCMP so it should talk with a software DDCMP
implementation, such as one that uses a DUP.

The DUP has only been tested talking to the KDP and DMC/DMR on RSX.   If
someone wants to try on RSTS I'd like to know if any issues are found.

I'll see what I can do.   Since a DMC/DMR does DDCMP itself, it shouldn't
matter what OS is talking to it; if you get success with DECnet/RSX, I would
expect it to work with DECnet/E as well.

Or, since it doesn't know sync from async, it will probably talk to 
a software DDCMP implementation that uses a terminal interface.

I believe that it should also talk to an OS based DDCMP implementation
which uses Async ports.     If someone is willing to test this, I'll work on
any kinks which may be found which might inhibit this.

I'm trying to make some progress on that (using RSTS V10.1).

Let me know.   I'm interested in using RSTS/E to link TOPS-20/KS.

	paul

--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects

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