>Hmm, if the RLV11's go into a ABCD backplane, and the BA11 is such a
>backplane (18 bit all 9 slots have CD connected) could you plug a backplane
>into the BA11 using one of those extender ables (two dual connectors on
>each end) ?
It's not exactly clear to me what you're asking, Chuck. If you're
asking a general backplane expansion question, the answer is probably
contained in Micronote 29, *Q-bus Expansion Concepts*, available
over the web from
http://metalab.unc.edu/pub/academic/computer-science/history/pdp-11/micronotes/
Only the AB slots are continued between backplanes, not the CD slots,
in any conventional configuration. Note that there are both 18-bit
and 22-bit bus cable-cards; the M9400/01 series are 18-bits, and
the M9404/05 series are 22-bits. For more information on 22-bit
vs 18-bit options, see Micronote 5, *Q22 Compatible Options*.
According to Micronote 5, not only does the RLV11 pay attention only
to the low 18 bits, it also uses backplanes pins BC1 and BD1
for purposes other than BDAL18 and BDAL19, so other things are
likely to break if its plugged into a 22-bit backplane.
--
Tim Shoppa Email: shoppa_at_trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
Received on Sat Apr 03 1999 - 16:45:56 BST