It's not that. XXDP runs fine with an RLV12.
Thanks, Pete, Guy and Lyle (who phoned me) for the suggestions. After
some poking around and much time spent peering into dark corners with a
flashlight, it turns out that the RLV12 is the source of the problem. I
managed to borrow another RLV12 board and that one works fine, for both RSX
and XXDP.
So, option #1 is that the first RLV12 is just bad, although oddly so as it
apparently works for RSX but not XXDP.
However, I notice that the working RLV12 has a couple of ECO wires on it
that are absent from the "non-working" RLV12, and I can't help but wonder
if
that has something to do with it. Does anybody know the ECOs for the
RLV12/M8061 and whether they have any bad effects on XXDP?
Thanks again,
Bob