[futurebasic] Re: [FB] [R7] Serial port control under Mac OS X

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From: Peter Bancroft <peter@...>
Date: Mon, 4 Nov 2002 10:31:21 +1100
>The other thing that confused me is that the Stamp echoes even if it's
>powered off.  I never would have expected that.  The Stamp must have an
>internal loopback, I know it's not the KeySpan adapter.

That's very puzzling. I've never met anything that loopsback when it is
off. It may be crosstalk in the cable. What happens when you pull the cable
out at the stamp end. If it eachos, it is definitely crosstalk. If it
doesn't then maybe the stamp needs some input pulldown/pullup resistors.
Don't assume that the stamp board is correctly designed.