11 Mar
2026
11 Mar
'26
8:05 a.m.
On Mar 11, 2026, at 7:08 AM, Hans-Ulrich Hölscher
<vaxorcist(a)googlemail.com> wrote:
You've probably noticed that I'm not very familiar with RT-11; my operating
system "home" is VMS.
I've got three more questions, two for SIMH (but related to DECnet-RT) and one for
RT-11 / DECnet-RT.
- I am familiar with connecting two SIMH VAX instances for asynchronous serial DDCMP,
which looks like:
VAX A:
SET DZ ENABLE
SET DZ LINES=4
ATT DZ LINE=0,44012,CONNECT=127.0.0.1:44021 <http://127.0.0.1:44021/>
VAX B:
SET DZ ENABLE
SET DZ LINES=4
ATT DZ LINE=0,44021,CONNECT=127.0.0.1:44012 <http://127.0.0.1:44012/>
The first question is how to configure a SIMH PDP-11 running DECnet-RT and a SIMH VAX
running DECnet-VAX over asynchronous serial DDCMP.
You should be able to to set it up similar to your VAXes, just use DLI/DLO as the devices
for DECnet-RT as I described in my notes. Make sure both ends have the same “;notelnet”
setting.
The second question is how to configure two SIMH
PDP-11s running DECnet-RT over asynchronous serial DDCMP.
Same as above except both ends will use DLI/DLO.
The third question is can I start e.g. FAL and
continue interactive work, e.g. using RVT?
No. As I said the images we have are for an unmapped system so once you’ve loaded FAL
there’s very little memory left (probably < 1KB). If we could find a full kit it would
probably at least 124KW and probably allow multiple jobs, but that’s just a guess!
I hope I'm not being too pushy - Thanks a lot for
your valuable continuous help!
No problem,. I’m glad the notes were useful.
John.
Ulli.
Am Mi., 11. März 2026 um 07:52 Uhr schrieb johnforecast--- via cctalk
<cctalk(a)classiccmp.org <mailto:cctalk@classiccmp.org>>:
>
> > On Mar 10, 2026, at 3:11 PM, Paul Koning via cctalk <cctalk(a)classiccmp.org
<mailto:cctalk@classiccmp.org>> wrote:
> >
> >
> >
> >> On Mar 9, 2026, at 11:18 AM, johnforecast--- via cctalk
<cctalk(a)classiccmp.org <mailto:cctalk@classiccmp.org>> wrote:
> >>
> >> I have been able to bring up the DECnet-RT images, that Jay posted a few
weeks ago, on OpenSIMH. Below are my notes on how to get it running.
> >> ...
> >> The following programs are available:
> >>
> >> NCP - Network Control Program
> >> NFT - Network File Transfer
> >> TLK - Interactive talk with another (remote) terminal
> >> RMT - Remote terminal (RSX)
> >> RVT - Remote terminal (VMS)
> >> CED - Dumps internal DECnet data structures (/AL dumps everything)
> >>
> >> The following servers are available:
> >>
> >> NML - Network Management Listener (use with NCP)
> >> FAL - File Access Listener (use with NFT)
> >> LOOPER - Loop testing (use with NCP LOOP NODE name)
> >
> > So there is TLK but not the matching server (LSN)? It should talk to RSTS, I
assume. And PyDECnet has a LSN also.
> >
> > paul
> >
>
> According to the object definitions, it looks like TLK is both client and server.
>
> John.
>