29 May
2002
29 May
'02
6:57 p.m.
...you plug a quad-width board into a Q/CD slot, and the board has its grant
enable jumpers in place? Is there any chance that this would kill the board?
--
Jeffrey Sharp
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30 May
30 May
8:21 a.m.
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10:58 p.m.
Yes, the jumpers will short lines together, and because CD interconnect
is NOT a bus, but instead only connects adjacent cards point to point,
it will heavily depend on what the neighbor boards happen to do with
those pins shortened by the continuity jumpers.
You may be lucky if no connection at all, or on at most one of the lines
in a jumpered pair is made from the neighbor: in this case, everything
will be fine. However, I would at least leave a big red sticker when
putting cards in such a way...
Andreas
Tony Duell wrote:
--
Andreas Freiherr
Vishay Semiconductor GmbH, Heilbronn, Germany
http://www.vishay.com
...you plug a quad-width board into a Q/CD slot, and the board has its grant
enable jumpers in place? Is there any chance that this would kill the board?
AFAIK those grant jumpers just short a couple of pins together on the C/D
part of the connector. So it appears to the rest of the bus as if there's
a grant continuity card there.
Putting them in on a card in a slot with CD interconnect will not damage
that card, but it might damage other cards in the bus (if anything else
is driving those pins -- maybe a card in the slot above or below -- then
it might not like having them shorted to something else).
-tony
31 May
31 May
2:31 a.m.
On Friday, May 31, 2002, Andreas Freiherr wrote:
Yes, the jumpers will short lines together, and because CD interconnect is
NOT a bus, but instead only connects adjacent cards point to point, it
will heavily depend on what the neighbor boards happen to do with those
pins shortened by the continuity jumpers.
The answer in my case is "nothing". Neither the CPU nor the memory do
anything on the CD fingers except connect the grant lines. They work just
fine in the Q22/CD slots.
As a final check, I did have a friend go spelunking in his own 23+ to see if
his CPU and memory were in Q22/CD slots. They were, and the jumpers were
indeed in.
--
Jeffrey Sharp
The email address lists(a)subatomix.com is for mailing list traffic. Please
send off-list mail to roach jay ess ess at wasp subatomix beetle dot com.
You may need to remove some bugs first.
10:08 a.m.
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