I can't answer your question, but I recall hearing about a similar
device and tried to find one once... It was like chasing a phantom...
Watch ebay. I think most commonly they came with a 90 degree bend for
the Mac II's. I recall that not all Macs from that era used the same
expansion bus... I suspect that even if it is as simple as you hope,
it still may require a special jumper between pins to get it to work.
I'd be interested in hearing what you find. Fortunately I have an
accelerator with a pass through PDS bus. I haven't unpacked my SE/30
since I moved this summer, but it is hopped up with a 50MHz accelerator
and an external video card. 128Mb RAM, and a Network connection via a
SCSI to eithernet adapter. Beware of self powered SCSI/ethernet
adapters... THEY WILL FRY YOUR MOTHERBOARD! The SE/30 can't supply
the power needed. I know from experience. The only original part
in my SE/30 is the case and maybe a cable here or there.
Mike
On Wednesday, November 23, 2005, at 03:10 AM, Kennedy, David wrote:
We all know that SE/30 PDS cards can be stacked if one of those cards
has a
pass-through socket. But this makes me wonder how the PDS really
works.
Is the pass-through literally a passive electrical connection? Is
there a
short circuit between the main and passthrough plugs on the bottom
card? In
other words, does the second card simply bypass the first, and are both
directly connected to the SE/30 logicboard? Or to put it another way,
are
the PDS cards all connected to a completely passive bus?
If that were so, then it would be easy to fabricate a splitter card
with a
single socket to go into the logicboard plug, and two plugs coming out
of
the top like so...
^ ^ ^ ^
| | | |
---------------
| |
^ ^
... thus making room for two cards to go in side-by-side. In fact I
think
I've seen PCI riser cards like this.
This is such an obvious move that I'm assuming that it can't be right.
Otherwise everyone would be doing it and cramming their SE/30s with
cards.
Can anyone clarify?
Regards
David Kennedy
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