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I've built another extender set, but it works just like the first, so something else must be going on. We will eventually be getting a logic analyzer as well, but for now I guess we'll have to rely on yours Mark. It's too bad you ordered from Patrick, or you might have had an extender in your hands very soon .

Stu


Mmm.. okay, zero for two indicates a possible design or component issue.
The likely candidates are the MAX3237 and/or MAX3241E line drivers.

The MAX3241E looks a tad slow for this application -- no timing margin to speak of, really. I'm not sure about the MAX3237 -- there's an 'E' version of that chip which does look fast enough. I wonder which exact parts you have there?

Cheers