> On Mar 15, 2016, at 5:47 AM, Johnny Billquist <[email protected]> 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likely that Phase I was created at some time, only to be superseded by a Phase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.
paul
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