Robert Rolf wrote:

> You CAN draw enough to light LED's without causing a problem with the signal.
> I've been doing it for decades now with an early break out box.
> They wouldn't have sold 10's of thousands of them if they didn't work.

of course they work!
And so does my PIC programmer on Serial port, with no Parts :-)

But, if it has to be a measurement tool, I'd not take the risk of 
interfering with existing appareil


-- 
Ciao, Dario
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