19 Nov
2021
19 Nov
'21
12:22 p.m.
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:
--
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
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