>> That means two boxes with q22 interconnect cables would be required
>> to produce a slave that has more than the 1meg onboard.  [...]

> It also means that even if you do want to try installing the second
> CPU with its on-board memory, you can't... since it can only be
> plugged into the PMI (CD) slots, which are already being used for
> communication with the primary CPU...

This gets into stuff I have personal experience with.

I have worked with a MicroVAX-II system with two CPUs in a single
backplane.  It was the backplane with three C/D slots; I can never
remember the nomenclature.  We had a KA630 in slot 1, a memory board in
slot 2, and another KA (I think it was a 630 at one point and a 620 at
another) in slot 3.  The slave processor had only its onboard 1M of
memory, of course, but it didn't break anything to have it plugged into
the same C/D interconnect as the master CPU and the memory board.

No backplane hacks were required; it was a stock bus.

					der Mouse

			       mouse@rodents.montreal.qc.ca
		     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B