I managed to compile a few of the different UPS tools under LinuxPPC, and connect my UPS to the printer port through a serial adapter, and it worked.
Of course if you have a spiffy UPS that uses a funky serial cable to get extra functionality (SmartUPS+), you'll lose the extra functionality. Basically, you can detect "low battery" and "line power outage" and "overload" modes, but not things like battery life, current load, and all the other stuff.
But this is a good thing. This means you can save yourself a few hundred bucks by getting a cheaper UPS (CyberPower makes some great stuff for next to nothing).
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