> Can you do the same thing with Mac OS? Nope. Apple has based Macs on 6 different architectures ["24-bit" 68000, 32-bit 680x0, 32-bit PowerPC, 64-bit PowerPC,

> Can you do the same thing with Mac OS? Nope. Apple has based Macs on 6 different architectures ["24-bit" 68000, 32-bit 680x0, 32-bit PowerPC, 64-bit PowerPC, x86, x86-64]. Each migration has had a few years of backward compatibility that was phased out in favor of the new architecture.