11 Sep
2022
11 Sep
'22
9:20 p.m.
On tops10, you have DN87S on KL and DN87 on DL10/KI10.You bypass the MCB phase 3 stuff
by using the DDP device and "tunnel" phase4 to a IO device on the front end,
that can be
a ASYNC, SYNC or even Ethernet.
Look for "DDP" in tops10 dnadll.mac and netdev.mac.
-Peter
----- Original Message -----
From: "tommytimesharing"
<tommytimesharing(a)gmail.com>
To: "The Hobbyist DECnet mailing list" <hecnet(a)lists.dfupdate.se>
Sent: Sunday, September 11, 2022 1:21:35 PM
Subject: [HECnet] Re: An example of non-optimal setup
Yes, I meant to say KS.
The difference I was trying to make is that last official release of
Tops-10 on a KS supports Phase IV whereas the last official release of
Tops-20 does not.
Yes, these DN-somethings were called DN20's if they ran MCB (DECnet) and
DN60's if they ran the IBM communications software. The last release of
MCB was limited to Phase III routing. The hardware was whatever the
particular PDP-11 would support, I think they ran PDP-11/34's and not
the PDP-11/40 that the RSX20F master front-end ran.
Roughly speaking, I only remember there being two kinds of interfaces,
'fast' and 'slow'. The fast interface was called a KMC and would do
about 50K baud, asynchronous. I don't quite remember the name of the
slower interface or its speed, but maybe it did 9600 Bd.
On 9/10/22 5:13 PM, Robert Armstrong wrote:
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A Tops-10
node appears to be able to have separate connections via a KDP, viz:
It's
not a TOPS-10 issue; it's a KS10/2020 limitation because Ethernet is not
supported on that machine. The KDP is actually a combination of one KDP and
one or more DUPs. Each DUP is a single synchronous line interface and you can
have up to four. They can be used for either DECnet or ANF10. I believe that
officially DECnet only supported one DUP line, but in practice you could have
more.
But on a KL10, of course, it's the same as for TOPS20 and normally you'd have
the NI20 Ethernet interface. But I'm pretty sure there was a DN-something
front end that supported synchronous DECnet circuits, so I would expect those
were possible too.
Bob