[HECnet] ANF10 network --> DN200 (RJE, Decnet) --> should be Ddcmp --> Re:4
R. Voorhorst
R.Voorhorst at swabhawat.com
Fri Nov 19 03:22:30 PST 2021
Well, that leaves 0,01% chance to see that assumption defeated so why not test it?
I'll see next week if that can be tested if a software testbed can be found to support the single Dup11 that wise: VMS at least does not in the Decnet corner but Vax Psi may be different. Maybe Rsx-11M+ would be a suitable testbed?
Reindert
-----Original Message-----
From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Mark Pizzolato - Info Comm
Sent: Friday, 19 November, 2021 05:19
To: hecnet at Update.UU.SE
Subject: RE: [HECnet] ANF10 network --> DN200 (RJE, Decnet) --> should be Ddcmp --Re3
I have not followed the details of this conversation, BUT I'm 99.99% sure that a PDP11 can be configured with just a DUP with DECnet using that interface, and that DUP can be "wired" to another simulator which has a DUP, KDP/DUP or a DMC and DECnet can be spoken just fine.
- Mark
On Thursday, November 18, 2021 at 3:35 PM, Reindert wrote:
>
> No, the Dup is only simulated as Kdp/Dup combo, hence the Ddcmp
> characteristics of the pair.
>
>
> Reindert
>
> -----Original Message-----
> From: owner-hecnet at Update.UU.SE [mailto:owner- hecnet at Update.UU.SE] On
> Behalf Of Johnny Billquist
> Sent: Friday, 19 November, 2021 00:31
> To: hecnet at Update.UU.SE
> Subject: Re: [HECnet] ANF10 network --> DN200 (RJE, Decnet) --> should
> be Ddcmp --Re2
>
> Fair enough.
>
> But DUP11 is a sync character based interface. So that one too
> requires that you do DDCMP in software. But I didn't think simh simulated a DUP11?
>
> Johnny
>
> On 2021-11-18 23:33, R. Voorhorst wrote:
> > Yes, but they are async lines and these are indeed character based
> > with
> software determining the protocol, not so the sync liness. Async
> decnet ddcmp behaves slightly differently from sync decnet ddcmp in
> number of characters used. Look at the packet contents in used
> characters and in between.
> >
> > Reindert
> >
> > -----Original Message-----
> > From: owner-hecnet at Update.UU.SE [mailto:owner-
> hecnet at Update.UU.SE] On
> > Behalf Of Johnny Billquist
> > Sent: Thursday, 18 November, 2021 23:23
> > To: hecnet at Update.UU.SE
> > Subject: Re: [HECnet] ANF10 network --> DN200 (RJE, Decnet) -->
> > should be Ddcmp --Re
> >
> > Well... RSX for example can talk DDCMP over DZ11 or DL11 lines just
> > as well,
> which are plain simple serial lines existing in simh.
> > Hopefully such lines can be connected with interfaces doing DDCMP in
> hardware (simulated in simh of course), and it should all work.
> >
> > And any software running in RSX just have an interface that gives
> > the
> DDCMP packet layer. The actual serial lines are not accessible as such
> by any other software than the DDCMP driver.
> >
> > Johnny
> >
> > On 2021-11-18 23:01, R. Voorhorst wrote:
> >> Point in this case is that the ddcmp is handled in Simh and not in
> >> system
> software so software can only deal with packets/messages; there is
> need for a simh sync line where the software itself will be able to
> communicate in bytes/characters and synthesize the packets/messages as
> the next higher organization.
> >>
> >> Reindert
> >>
> >> -----Original Message-----
> >> From: owner-hecnet at Update.UU.SE [mailto:owner-
> hecnet at Update.UU.SE] On
> >> Behalf Of Johnny Billquist
> >> Sent: Thursday, 18 November, 2021 22:39
> >> To: hecnet at Update.UU.SE
> >> Subject: Re: [HECnet] ANF10 network --> DN200 (RJE, Decnet) -->
> >> should be Ddcmp
> >>
> >> Well, a serial line over which DDCMP is running is purely a packet
> >> based
> interface.
> >>
> >> Johnny
> >>
> >> On 2021-11-18 21:46, R. Voorhorst wrote:
> >>> Indeed it is Ddcmp, but the meaning is the difference between
> >>> packet/message oriented and character oriented and the latter
> >>> should
> also exist.
> >>>
> >>> Reindert
> >>>
> >>> -----Original Message-----
> >>> From: owner-hecnet at Update.UU.SE [mailto:owner-
> hecnet at Update.UU.SE]
> >>> On Behalf Of Robert Armstrong
> >>> Sent: Thursday, 18 November, 2021 21:11
> >>> To: hecnet at Update.UU.SE
> >>> Subject: RE: [HECnet] ANF10 network --> DN200 (RJE, Decnet)
> >>>
> >>>> Paul Koning <paulkoning at comcast.net> wrote:
> >>>> They speak DDCMP, yes, but not DECnet. Any protocol layered over
> >>>> DDCMP
> >>> should work.
> >>>
> >>> Indeed, and we just proved that with ANF10 which uses the
> >>> DMCs and DUPs but is not DECnet.
> >>>
> >>> Bob
> >>>
> >>>
> >>>
> >>
> >
>
> --
> Johnny Billquist || "I'm on a bus
> || on a psychedelic trip
> email: bqt at softjar.se || Reading murder books
> pdp is alive! || tryin' to stay hip" - B. Idol
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