My first thought was the IBM 3000va UPS with switchable 208, 220, 230 and 240volt modes.
And as for frequency, just like in the REM song, I dont really have a response... it doesnt matter. Nearly everything in the electronic world can take 50 or 60hz.
But his kicker, was that he didnt want to power a computer, but an exercise machine.
That point caused me to lose my religion against complacency on frequency. All US motors (as in exercise machine treadmill drive) would actually slow down under the reduced 50hz frequency. So, in this case, frequency does matter. Unfortunately, UPSes input and output whatever frequency you give them. To change frequency you need a Genset or something god-awfully expensive.
Bottomline, when our travelling exerciser goes abroad, she should leave the treadmill and hit the dance floors instead. may I suggest DJ Ghostchild's Euro Pop version of Losing My Religion
