> It's not what I'd naively expect, but sure.  Maybe the protocol 
> expects some kind of ACK and keeps retransmitting otherwise. 
> Maybe the protocol's weird.

Ah I see! The output was just tiny black circles with embedded question
mark.

> > Is this a good sign that my touch screen is
> > attached to serial port 4?
> 
> Yes!

Cool! Thanks.

Regards,
RG.

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