> On Mar 15, 2016, at 9:13 AM, Paul Koning <[email protected]> wrote: > > >> 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 likely that Phase I was created at some time, only to be superseded by a 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 > >
I joined the Communications group in Jan ’77. They were responsible for DECnet-8, DECnet-RT, DECnet-11M/S and DECnet-11D/IAS (all phase II at that time). Sometime around the middle of the year all of the PDP-8 developers (maybe 2) moved out and a few months later the RT developers left as well. The remaining products shipped about a year later. All the RSX products used a common implementation of NSP to ease interoperability. A generic DECnet-8 would have been a tight squeeze and the same for DECnet-RT (not sure if mapped system support was available then), it was pretty difficult getting an unmapped DECnet-11M system configured and even worse on 11S (at least you could overlay NETACP on 11M). John. > _______________________________________________ > Simh mailing list > [email protected] > http://mailman.trailing-edge.com/mailman/listinfo/simh _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
