I've got a whole lot of machines that can't run Linux, mainly my XT's 8 bit Atari's, Atari ST's Commodore 64's and MSX's won't run it, neither my 286 and 386 machines..
The oldest Linux machine I've ever used was a Pentium 133 with an ancient version of Puppy Linux.
I've got three Xubuntu 12.04 machines, an AM-2 Sempron 2800+, a Socket A Sempron 2200+ and a P-4 machine, the older two are a tad sluggish here and there but function well enough, the AM-2 machine works quite okay.
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