>I can be reasonably assured that as long as asynchronous serial
>ASCII data can be sent and displayed on something, somewhere,
>my device will still be usable without alteration or updating.
>I don't have to care whether Windows, Linux, Java or anything
>else comes and goes, my customer is set

I agree. The current project I have is for a PIC to communicate with
something written in C running on windows, so I specified the link to run
only with printable characters, and all variables passed across as hex
characters. Makes link debugging easy, and deciding which end is at fault
even easier. Also meant I could do my development with a dumb terminal.

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