http://intuitionbase.com/static.php?section=a1introBut basically, Eyetech licensed some PPC hardware designs from MAI logic and relabelled them AmigaOneSE, AmigaOneXE, MicroA1.. They have 800mhz g3/g4's, sdram, agp, pci, ATX and Mini ITX formfactors. They havent been on sale for years now though. They're the only computers that run AmigaOS4 right now.
