@Blinx123
There is no way to legally purchase and run OS4 at this time. If you want to try OS4 you have to buy an expensive used or possibly refurbished, buggy and failure prone, "AmigaOne" motherboard.
As for other hardware or emulators? As others have mentioned, no, not legally and probably not illegally either. There have been rumors of bootleg versions for Pegasos hardware and/or PearPC, but I'd guess these rumors as being false until I see proof otherwise.
