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That seams really really interesting...
I have done it before...its only good for a shutdown though as my motherboard dont support the wake-on-ring from completely off.
I have posted a more detailed info in another forum before...cant find it no more though. Theres a page on microsoft somewhere showing which pins of comport does what for the UPS shutdown.
It is even possible to connect the pin of the comport directly to a +12V supply. But Ill rather limit it with a zener diode and resistor to be on a safe side.
If you are interested do a google else Ill dig it out for you.
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