The 3 bergs to unibus was used in the RK8-E, the unibus end plugging into the first physical drive.
Between unibus backplanes were always M920, M9202, bus margin jumpers, which i can't remember the part numbers, and various Albe and other non-dec options. The cable was always a BC11A-XX, i think 2 to 25 or maybe 50 feet. This is from the PDP11 world. i never played with the 725, 730, or 750. On Mon, Jun 22, 2015 at 11:23 AM, John Wilson <wil...@dbit.com> wrote: > On Mon, Jun 22, 2015 at 11:46:08AM -0400, Noel Chiappa wrote: > > > I've seen M9014s only at the far end of the UBAs on a KS10, so it > > > wasn't taking the place of a BC11. > > > >??? If it wasn't take the place of a BC11 (i.e. proving a path for the > UNIBUS > >out), what was it doing? > > OK then I guess it *was* taking the place of a BC11. :-) I just meant it > wasn't jumping directly from one DD11 to another, so the "source" end > really was three Bergs, not a DD11 slot. I've seen that done only with the > fancy flexprint cable, not two paddles and three ribbon cables, so I was > kind of assuming that there's some impedance-matching (etc.) problem with > using ribbon cables for more than one hop. But then again ... I chose the > digital version of EE as my major precisely because I knew I'd flunk Fields > and Waves. Transmission lines are black magic as far as I'm concerned! > > John Wilson > D Bit >
