30 Dec
2012
30 Dec
'12
5:49 p.m.
On 2012-12-30 23:00, Glen Slick<glen.slick at gmail.com> wrote:
On Sat, Dec 29, 2012 at 3:44 PM, Jerome H.
Fine<jhfinedp3k at compsys.to> wrote:
I think you are right, Glen. The M8190 is intended to sit in a Q-CD
slot, not a Q-Q. I'd surprised if it works.
However, if you ever want to put an M8190 in a VT103 you need to rewire
the backplane anyway, as the VT103 backplane don't even do Q22 if I
remember right.
>
>So the quick answer is probably that all M8190 boards are PMI capable, but
>the PMI is not activated if PMI memory is not present in the correct
>slot(s).
>In addition, probably all M8190 boards are happy being placed into a VT103
>backplane which will not support PMI activation.
>
>Of course, I can't guarantee there won't be magic smoke released if the
>M8190-AE
>is placed into a VT103 backplane.
>
I remain skeptical that everything will just be fine if you place an
M8190 KDJ11-B into a non-Q22/CD backplane.
If you look at Table 2-9 (page 2-19) and Table 2-10 (page 2-20) in
EK-KDJ1B-UG_KDJ11-B_Nov86.pdf, won't placing an M8190 into a
non-C22/CD backplane essentially connect the CA1-CV1 signals in Table
2-10 straight through to the AA1-AV1 signals in Table 2-9, and same
with the DA1-DV1 signals and the BA1-BV1 signals? That doesn't seem
like something that would allow normal functioning. Also, it is clear from Table 2-10 that the PMI signals
on the M8190
only exist on the top (component) side of the board and can only
communicate over the PMI with memory boards physically located above
the M8190.
Correct. The PMI memory for PDP-11s work in both Q-CD slots and PMI
slots, but they only perform as PMI memory if they sit above the CPU in
a Qbus backplane.
I'm not sure the PMI memory boards would work in Q-Q slots either...
Johnny