On Oct 10, 2015 12:27 PM, "Eric Smith" <space...@gmail.com> wrote: > > > Anyone disagree, and if so why did DEC want their 11/05 S to use "D" model > > core (D=parity) and not C (C=no parity)? The PDP 11/40 I have uses C. > > The H217D is the no-parity plane, and the H217C has parity. > > For the parity to do anything useful, you have to also have an M7259 > module, and IIRC the 11/05 backplane is not wired for it.
Thanks. I tried an m7259, no dice, but I need to read the manuals thoroughly as to why and see what changes would be needed. Bummer because the 217d almost works
