When I joined DEC in 1980, Software Services was working on links out of the building. PDP-11/70's running RSX-11M-PLUS used DMC-11's (later DMR-11's) to connect to the outside. At first VAXWRK:: (VMS) was connected to ASTRIX:: (RSX-11m-PLUS), and that was connected to the other building that connected the campus to the outside. What they used to connect the Parker Street Campus to other campuses I just don't remember. Serial lines of some sort probably. The max speed was 56K. SET HOST from Maynard, MA to Nashua, NH worked quite fast (for me anyway) :-) Later, DMC's/DMR's were replaced by Ethernet cards (DEUNA's et al). RT-11 used mostly serial links at fairly low speeds. I want to say somewhere between 1200 and 4800 baud - I don't really remember - it's been too long. At least one of the data centers in Parker Street used DECsystem-10's. I have no idea how they were connected. -Steve -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Johnny Billquist Sent: Sunday, July 01, 2012 21:34 To: hecnet at Update.UU.SE Subject: Re: [HECnet] This is probably been asked already but.... On 2012-07-02 03:17, Gregg Levine wrote: On Sun, Jul 1, 2012 at 9:10 PM, Bob Armstrong <bob at jfcl.com> wrote: Dave McGuire wrote PDP-8: there's a DECnet implementation for OS/8. Do you actually have such a thing? There was a partial implementation for RTS/8 that was, AFAIK, never released. I have some sources for it, but it's unfinished. Bob Hello! About all I found was those sources, on the iBib site. And for the other OS, no hits so far on Google. Steve interesting story, and yes I'm not asking about those three letter agencies. Let me put it to all of you this way. In the book "Cuckoo's Egg" as related by Cliff Stoll, his(?) VAXes were networked, via Ethernet all over the campus, (either running BSD or VMS), but they were connected to the Internet via leased lines. And in a Doctor Who book, who's reasonably accurate on the DEC based side of things, and lousy on the desktop side, there are PDP-11s and possibly a few early Vaxes. and even an Eclipse. What I am curious about is how the PDP-11s talked to DEC Net based systems. And which ones of the R* operating systems could be confused into doing that, and in what ways. Well, considering the fact that DECnet was born on the PDP-11, the question should perhaps be rephrased as how non-PDP11 systems managed to talk on DECnet. :-) If the question is more on a practical note of how connections were done, I think the original was over serial lines, but I might be wrong. Multidrop as well as some high speed links were available in Phase III, but ethernet only became an option with DECnet phase IV. Not sure about the time frame for packet switched interfaces. They certainly existed in Phase IV, but I don't know if they were available already in phase III. The RTS-8 DECNET/8, which was mentioned earlier, talks DECNET over a serial line, using DDCMP. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol