On 2016-03-15 14:13, Paul Koning wrote:
On Mar 15, 2016, at 5:47 AM, Johnny Billquist <b...@softjar.se> wrote:
...
I don't remember who I talk to, but it might have been Paul, but it appears
DECnet-8 is pretty much Phase I, from what we figured out. Maybe DEC wrote some
newer version that have not been found, since documentation and SPDs mention
Phase II.
I saw an RTS/8 document that describes Phase I -- studied it some to see what
Phase I protocol looks like. The answer is: significantly different from Phase
II, not interoperable, no plausible way to make it interoperate. The key
problem is that the NSP details are different, so a Phase I endpoint trying to
talk to a Phase II endpoint would get lost. Compare that to Phase II through
IV where the NSP is basically the same -- Phase III adds retransmission, but
the packet formats are upward compatible.
But I also remember hearing about Phase II on PDP-8 systems. So it seems
likely that Phase I was created at some time, only to be superseded by a Phase
II implementation.
Like I said, I can't remember if it was you or someone else I was
talking about DECNET-8 with.
But there are some things that looks slightly inconsistent with what I
understood from Phase I, but it also seemed pretty clear not to be Phase
II. But I'd be happy to look more at it, if someone is interested.
And I think Bob asked about the physical links. DECNET-8 do use standard
serial ports, and there is a DDCMP implementation in the software.
Johnny
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