optional connector Re: [Open-graphics] FAQ for OGD1 order page

[Dieter]

> > > 68 user I/O signals on an optional 100-pin ICD connector
> > 
> > So the idea is the customer buys a connector and solders it on?
> > IIRC the connector is more expensive than one would expect,
> > but leaving off a connector on a $1500 board doesn't sound right.
> > Customers may not like the idea of risking their warranty by
> > modifying the board.
> 
> I don't know. IDC Connectors are something everyone who
> does some electronics has.. in the dozens. And they
> are not expensive at all. At least not compared to
> what other connectors cost. You can get one here in
> Switzerland the cheap ones for something around 2-5 CHF
> (1:1 USD) of 2x50 in single quantities.

The common standard inexpensive IDC connectors do not fit the
hole pattern on the board.  Once you add the $30 connector
it provides the standard IDC connector for a ribbon cable.

>From a posting by Timothy 2007-03-27:

TNM> Subject: Re: [Open-graphics] General Purpose I/O Connector

TNM> The hole positions don't line up with the pins.  That is, the PCB
TNM> holes are staggered, while the connector pins are not.

TNM> They're through-hole.

TNM> IIRC, it's something like $30.

I still don't know why the $30 connector was chosen rather than
the cheap (US $0.40-$1.20 quantity 1) connectors.  Perhaps due to
board real estate, or signal routing issues?  Too late now.