> This board is plugged into the two connectors of
the last memory board
>in the chain. The cables are then connected to the terminator instead
>of the board itself.
Huh? Perhaps you mean that the way the board connects
to
the rest of the machine is *through* the cables (i.e. there
is not some other set of connectors on the board that plug
into a "backplane")? So, *normally* the cables plug into the
memory board but, on the last board, the terminator sits
"between" the cables and the board?
In other words, any solution *must* have 4 connectors
on it
(you can't just take two INDIVIDUAL connectors and solder
the RPAK's onto the back of those connectors (i.e. skip the
PCB entirely!)
I think that I could probably get away without putting on the pass-through. My IM2 cable
has 4 extra positions (IP2 + 1 IM2 are boards installed)
I think it unlikely that I will come across enough boards to where I would need the
pass-through (would need a FPA + 3 extra IM2s).
I (not being an EE) wasn't sure about the seriousness of the crosstalk/unwanted
reactance problem on computer busses. The downside to soldering
directly onto cables is that there is a separate power feed for the voltage divider
network that must be accounted for. Wire-wrap holds distinct possibilities, though.
While I'm messing around with this, does anyone else have an IRIS 3k sans
terminators?
Scott Quinn