19 Nov
2021
19 Nov
'21
9:17 p.m.
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