[HECnet] Hecnet and DDCMP

Jarratt RMA robert.jarratt at ntlworld.com
Mon Jan 9 13:03:16 PST 2012 

Sorry, away from home all week now and don't have this with me. Perhaps one of the other people I sent it to could send you the code.
  
Regards
  
Rob

On 9 January 2012 02:45, Mark Abene <phiber at phiber.com> wrote:
Can you please copy me on the source files?   For some reason I never
got this e-mail nor the attachments.   When you do, I'll see if I have
any time this week to adapt the relevant bits into the pdp11 source
(unless someone gets to it first).

Thanks,
Mark


On Sun, Jan 8, 2012 at 4:36 PM, Kevin Reynolds <tpresence at hotmail.com> wrote:
> Works even better.   I will let you know if I get it compiled.
>
> Thanks Rob!
>
> ________________________________
> From: robert.jarratt at ntlworld.com
> To: tpresence at hotmail.com; phiber at phiber.com; blairrya at cse.msu.edu
>
> CC: vaxorcist at googlemail.com
> Subject: RE: [HECnet] Hecnet and DDCMP
> Date: Sun, 8 Jan 2012 21:24:16 +0000
>
> No I have not done that. I can send you the sources though, so I have
> attached them. The main files are vax_dmc.h and vax_dmc.c, but they need to
> be linked into the main emulator. I don   t have time to go looking right now
> so I am sending you the whole source.
>
>
>
> Regards
>
>
>
> Rob
>
>
>
> From: Kevin Reynolds [mailto:tpresence at hotmail.com]
> Sent: 08 January 2012 18:24
> To: r.jarratt at computer.org; phiber at phiber.com; blairrya at cse.msu.edu
> Cc: vaxorcist at googlemail.com
>
>
> Subject: RE: [HECnet] Hecnet and DDCMP
>
>
>
>
> Rob,
>
>
>
> Do you have a diff or patch file for the changes you made in the code?   I
> use linux and macosx for my simh hosts, and want to fold it in (if its
> possible).   Reading the docs, it looks like it should be good, as long as
> there aren't missing headers/structures.
>
>
>
> Kevin
>
> ________________________________
>
> From: robert.jarratt at ntlworld.com
> To: phiber at phiber.com; tpresence at hotmail.com; blairrya at cse.msu.edu
> CC: vaxorcist at googlemail.com
> Subject: RE: [HECnet] Hecnet and DDCMP
> Date: Fri, 6 Jan 2012 17:18:13 +0000
>
> I am happy to share the code with those who expressed an interest in it, it
> is still not perfect so we don   t want to share it too widely yet, but
> clearly I am interested in any feedback you may have.
>
>
>
> Note that, as I said before, it has only been tested with VMS 5.4 and 4.6 on
> the VAX 780 emulation. I have never tried it with the PDP11 emulation. Also,
> the code has only been tested extensively on Windows, it has been compiled
> on Linux but only received very light testing. I only have a recent Windows
> build which I have attached along with a document explaining how to use it.
>
>
>
> Please note that work commitments mean that I will have limited time to
> support you over the next month, but I will try my best if you run into
> problems.
>
>
>
> Regards
>
>
>
> Rob
>
>
>
>
>
>
>
> From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf
> Of Kevin Reynolds
> Sent: 06 January 2012 04:16
> To: hecnet at update.uu.se
> Subject: RE: [HECnet] Hecnet and DDCMP
>
>
>
> I have RSTS/E but its v7.
>
>
>
> Kevin
>
>> Date: Thu, 5 Jan 2012 22:29:01 -0500
>> Subject: Re: [HECnet] Hecnet and DDCMP
>> From: phiber at phiber.com
>> To: hecnet at update.uu.se
>>
>> Assuming Rob makes his patch to SIMH available, is there anyone on
>> HECnet willing to test peering with my RSTS/E setup?
>>
>> On Wed, Jan 4, 2012 at 5:45 PM, Rob Jarratt <robert.jarratt at ntlworld.com>
>> wrote:
>> > Yes, you are right, I do add a 2-byte length to the start of each buffer
>> > that I send so that the other end can reassemble the buffer. Sorry, I
>> > did
>> > say this in an earlier draft of the email, but decided to leave it out
>> > to
>> > emphasise the simplicity of the implementation.
>> >
>> > Regards
>> >
>> > Rob
>> >
>> >> -----Original Message-----
>> >> From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE]
>> >> On Behalf Of Paul_Koning at Dell.com
>> >> Sent: 04 January 2012 22:15
>> >> To: hecnet at Update.UU.SE
>> >> Subject: RE: [HECnet] Hecnet and DDCMP
>> >>
>> >> I assume there has to be a bit more to it, because DDCMP is a packet
>> >> based
>> >> protocol (not a stream protocol as TCP is) and the higher layers rely
>> >> on
>> > that.
>> >> So there presumably is some form of framing in the emulated data stream
>> >> to
>> >> indicate where the packet boundaries are.
>> >>
>> >>          paul
>> >>
>> >> -----Original Message-----
>> >> From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE]
>> >> On Behalf Of Rob Jarratt
>> >> Sent: Wednesday, January 04, 2012 5:11 PM
>> >> To: hecnet at Update.UU.SE
>> >> Subject: RE: [HECnet] Hecnet and DDCMP
>> >>
>> >> All I do in SIMH is to take the data bytes each end wants to send to
>> >> the
>> > other
>> >> end and send them over a socket, so I don't get involved with DDCMP
>> > itself.
>> >> Both ends have to be SIMH for this to work. I don't do anything at the
>> > actual
>> >> hardware level, although that would be nice. I think you can get
>> > synchronous
>> >> serial cards for the PC but they are quite expensive.
>> >>
>> >> Regards
>> >>
>> >> Rob
>> >>
>> >> > -----Original Message-----
>> >> > From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE]
>> >> > On Behalf Of Paul_Koning at Dell.com
>> >> > Sent: 03 January 2012 21:18
>> >> > To: hecnet at Update.UU.SE
>> >> > Subject: RE: [HECnet] Hecnet and DDCMP
>> >> >
>> >> > DMC-11 speaks DDCMP V3.1 (give or take some bugs in the "high speed"
>> >> > version).   But that's sync only.   Depending on what you want to talk
>> >> > to, a
>> >> DMC
>> >> > (or its relatives DMR-11, DMP-11, or DMV-11) may not help; if the
>> >> > other
>> >> end
>> >> > speaks DDCMP over an async link (UART) then it won't work because the
>> >> > character framing doesn't match.
>> >> >
>> >> > That said, I wonder what it means to emulate a DMC-11.   You could
>> >> > have
>> >> > it speak DDCMP over a UART, or something else entirely.   If the
>> >> > former
>> >> > it
>> >> would
>> >> > talk to another DDCMP node; if the latter it would not but it would
>> >> > still
>> >> work
>> >> > for tying one emulated DMC-11 to another.
>> >> >
>> >> > If you want DDCMP, one approach is to get a copy of the spec, and
>> >> implement
>> >> > what it says.   That works; it is how I implemented DDCMP support for
>> >> > RSTS
>> >> V10
>> >> > (based on an earlier version based on V9.6).   The protocol is quite
>> >> > simple
>> >> and
>> >> > the spec is well enough written that, if you do what it says, the
>> >> > result
>> >> WILL
>> >> > interoperate with hardware such as the DMR-11.   The only tricky one
>> >> > is
>> >> > the
>> >> > DMC-11 because it has some undocumented bugs;   the main one I
>> >> remember
>> >> > is that the high speed version can't handle back to back packets.   I
>> >> > wish
>> >> I could
>> >> > contribute the code   I wrote but I can't, for various reasons one of
>> >> > them
>> >> is that
>> >> > it's a RSTS device driver and written in 100% assembly language.
>> >> >
>> >> > It would not be hard to do a version for other platforms; I once
>> >> > looked at
>> >> a
>> >> > Linux terminal protocol handler (forgot what that is called) that
>> >> > could
>> >> hook
>> >> > into DECnet/Linux.   Didn't get far enough on that, though.
>> >> >
>> >> >       paul
>> >> >
>> >> > -----Original Message-----
>> >> > From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE]
>> >> > On Behalf Of Mark Abene
>> >> > Sent: Sunday, January 01, 2012 6:06 PM
>> >> > To: hecnet at update.uu.se
>> >> > Subject: Re: [HECnet] Hecnet and DDCMP
>> >> >
>> >> > Jarratt, did you make this publicly available on the SIMH list?   It
>> >> > would
>> >> be great
>> >> > to have a DMC11 device emulated, since I insist on running RSTS/E v8
>> >> > (for historical reasons... it was the last real RSTS before "the
>> > pollution").
>> >> RSTS/E v8
>> >> > doesn't have ethernet support, so the only way I could have DECnet is
>> >> > via
>> >> a
>> >> > (previously unemulated)
>> >> > DMC11 interface.   Does yours work well?
>> >> >
>> >> > -Mark
>> >> >
>> >> > On Sun, Jan 1, 2012 at 3:23 AM, Jarratt RMA
>> >> > <robert.jarratt at ntlworld.com>
>> >> > wrote:
>> >> > > Working with a friend, I  have written a SIMH emulation of the DMC11
>> >> > > device, so you can do this with SIMH. It tunnels the bytes sent
>> >> > > to/from the device over a socket. We have used the SIMH emulation
>> >> > > to
>> >> > > connect my friend to HECnet over a (simulated) DMC11.
>> >> > >
>> >> > > The bit I am not entirely sure about is to what extent this is
>> >> > > using
>> >> > > DDCMP as I don't have a full understanding of DDCMP.
>> >> > >
>> >> > > Regards
>> >> > >
>> >> > > Rob
>> >> > > On 31 December 2011 18:46, The Presence <tpresence at hotmail.com>
>> >> > wrote:
>> >> > >>
>> >> > >> Hey guys,
>> >> > >>
>> >> > >> Has anyone worked out a mechanism to connect a node to hecnet
>> >> > >> using
>> >> > DDCMP?
>> >> > >>   Perhaps some tunneling technology over IP, or virtualized serial?
>> >> > >>
>> >> > >> Kevin
>> >> > >
>> >> > >
>> >

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