[HECnet] ANF10 network --> DN200 (RJE, Decnet) --> should be Ddcmp --> MarkP
R. Voorhorst
R.Voorhorst at swabhawat.com
Fri Nov 19 12:33:07 PST 2021
I updated the remark by Bob with this in my update and could not find that
back in your copy of the mail transcript:
Before I get a storm this from Pdp11_dup.c should accompany it:
The wire protocol implemented is native DDCMP WITHOUT the DDCMP SYNC
characters both initially and between DDCMP packets.
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 21:18
To: R. Voorhorst <R.Voorhorst at swabhawat.com>; hecnet at Update.UU.SE
Subject: RE: [HECnet] ANF10 network --> DN200 (RJE, Decnet) --> should be
Ddcmp --> Re:4 --> Cryptic -->Dup11 simh only for Ddcmp --> update
On Friday, 19 November, 2021 at 20:42, Reindert wrote:
> Yes, that is how Pdp10 KS10 and Vax and Rsx and Rsts all interface to
> the Dmc/Dmr offered layer and for Anf10 on Pdp10 as well.
> But trying Decnet on bare Dup11 will reveal all.
>
> However this will fail on simh: look at the comment in Pdp11_dup.c
> from
> Bob:
>
> dup DUP11 Unibus/DPV11 Qbus bit synchronous interface
>
> This module implements a bit synchronous interface to support DDCMP.
> Other
> synchronous protocols which may have been supported on the
> DUP11/DPV11
> bit
> synchronous interface are explicitly not supported.
>
> So the 0,01 % rises to 100% that it will not work as bare sync device
I don't see what you're saying will fail. The comments very explicitly say
that DDCMP will work. Other possible uses of the DUP11/DPV11 will not work.
The reason they wouldn't work when this pdp11_dup.c was written was due to
the lack of software on the PDP11 side and something on the other end of a
conversation to talk to. If such a useful test case existed the
functionality in the pdp11_dup.c code could be extended to support it.
- Mark
> -----Original Message-----
> From: owner-hecnet at Update.UU.SE [mailto:owner- hecnet at Update.UU.SE] On
> Behalf Of Paul Koning
> Sent: Friday, 19 November, 2021 17:23
> To: hecnet at update.uu.se
> Subject: Re: [HECnet] ANF10 network --> DN200 (RJE, Decnet) --> should
> be Ddcmp --> Re:4 --> Cryptic
>
> I assume it means that RSX (and RSTS too) lets you use a DMC directly
> from an application as an I/O device you can open. If so, you get a
> packet service that lets you transmit whatever packets you want, which
> will be sent encapsulated in DDCMP protocol. In the RSX case I'd
> assume that includes support for maintenance mode (in RSTS that isn't
supported).
>
> paul
>
> > On Nov 19, 2021, at 11:14 AM, R. Voorhorst
> <R.Voorhorst at swabhawat.com>
> wrote:
> >
> > Please can you explain your second sentence somewhat? I read: "...
> > the
> Ddcmp layer ... it does present it as a device ...". I do not perceive
> the connotation.
> >
> >
> > 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 14:46
> > To: hecnet at Update.UU.SE
> > Subject: Re: [HECnet] ANF10 network --> DN200 (RJE, Decnet) -->
> > should
> be
> Ddcmp --> Re:4
> >
> > RSX definitely can use a DUP11 standalone through DECnet. In which
> > case
> it's software side DDCMP.
> >
> > Heck, you can also use the DDCMP layer yourself, without involving
> DECnet.
> It does present it as a device to the system on which you can
> send/receive packets.
> >
> > Johnny
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