26 Oct
2013
26 Oct
'13
4:52 p.m.
On Oct 25, 2013, at 13:51, azd30 <azd30 at telus.net> wrote:
How would a quad card not mess about on the right hand
side? The only thing I can think of, is this. If the right hand side (CD) is wired for AB
there is power
on there. The quad card would just have to stay away from those pins. Does the CD part of
the quad card make use of the AB signals present?
By and large, quad cards (except ones specifically meant to use
the CD pins, like KDJ11-B, PMI memory and RLV11) don't
touch much on the CD slots. Usually they take the power, and they
may have jumpers to optionally provide grant continuity for
serpentine configurations (you would pull the jumper out for CD backplanes;
the KDF11-B does that, among others).
- Dave
I'm going by this:
http://www.ibiblio.org/pub/academic/computer-science/history/pdp-11/hardwar…
and my 'microcomputers and memories (1982)' handbook.
I'm feeling really 'dumb' right now...
cheers
--
alex