Gary E. Miller <gem@rellim.com>:
> > New information: Gary Miller tells me that the PL2303, FTDIO SIO, and 
> > Cypress M8 all have TIOCMIWAIT support.  So any of those should do.
> 
> Support in the driver code, yes.  But until tested I would not bet on it.

You have a point.  I suspect our odds would be best with a PL2303.
-- 
		<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>