> The page also claims that you can configure an output pin to drive an LED 
> so that it lights when the pin goes *low*... Man, electronics is weird!

Why is that weird?  The LED doesn't care which leg is connected to the logic 
output pin, it's just a voltage.  You could even connect the LED between two 
output pins*, then it would only turn on when one was high and the other was 
low.

* Using a series resistor if required...

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