11/70 board set on e-bay. . .

On Jan 14, 2008, at 10:02 PM, Richard wrote: No, (most) PDP-11s have standard *peripheral buses*, Unibus and Q- bus. In fact, most (all?) Unibus PDP-11s have backplanes that are specific to the processor being used, as nearly all of them are multi- board sets (LOTS of boards in the case of the 11/70) and the card- edge connectors carry processor-internal signals, not high-level Unibus signals. Some PDP-11s have their memory on the Unibus or Qbus, and some don't. The 11/70 (which I mention because that's what started this thread) does not. Some of them are "close relatives" like the 11/04 and 11/34, which share the same backplane. In those systems, for example, the first few slots are not Unibus, but carry CPU-internal signals. Later slots are Unibus. Qbus PDP-1s are more standardized across the product line. Most (all?) of them use an all-Qbus backplane and the CPU is contained on one board. -Dave -- Dave McGuire Port Charlotte, FL