On 3/27/07, Dieter <[EMAIL PROTECTED]> wrote:
> The connector we selected has two rows of 50 pins, and the spacing is
> the same as a PATA IDE connector. I don't recall how many pins are
> ground.
The picture I'm looking at has four rows of holes.
A standard 100 conductor ribbon cable would be about 127mm wide.
The connector would be slightly wider. This wouldn't fit.
The hole positions don't line up with the pins. That is, the PCB
holes are staggered, while the connector pins are not. Also, the
connector we chose has a right angle so that the pins are parallel to
the PCB.
Did you mean 2 50 conductor cables? Then the 4 rows of holes
would make sense, and it would fit.
Well, that's one thing. When we talk about an 80-conductor IDE cable,
we note that 40 of those conductors are actually ground. Indeed,
IIRC, a whole row of pins for IDE are ground. That isn't the case for
us. At least 70 of the pins on our connector are data.
There are smaller ribbon cables. Newer PATA cables have 80
conductor ribbon cables connected to special 80-to-40 pin connectors
with standard pin spacing.
I'm not sure of the details of all of that, really.
If these holes are thru-hole, connectors (or just pin headers)
could be added in the field. If they are surface mount,
soldering the inner rows could be tricky.
They're through-hole. There are these clips that you can get to crimp
onto wires and then push into the holes, if you like.
If these are standard IDC connectors, they shouldn't cost that much
relative to a "at least $1500" OGD board.
True. IIRC, it's something like $30. But keep in mind that the price
we're trying to keep down is the dev price. We still need to make a
small profit from those.
--
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Open Graphics Project
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