something occurred to me after i wrote my response to this thread: sun ported their OS to intel. and sun uses RISC bigendian processor. so i guess the technical difficulties are not too great. OS X could be done, and since the kernel is already done, it might not be too hard.
there still remain 2 issues with this: microsoft s OS supports an enormnous database of hardware. if apple ported OSX to the PC, it would have to worry about drivers for all the myriads of PC hardware components. right now apple only has to worry about supporting apple s hardware. it s the same with sun. i ve tried Solaris on intel. my video card and ethernet cards didn t work. you haver to have a hardware package endorsed by sun if you want a functional system. it is an attempt by sun to let users access the most popular UNIX on the market at much lower costs. sun s hardware is vcery expensive. i think they are mostly tyrying to make it easy for existing NT admins change over easily. sun is the most popular server OS, but windows server OSes have been getting popular. i guess OS X opens a new door of possiblities for server solutions, but i think it is a very iffy question, how that will turn out.
the last point is the difference in philosophies between the two platforms. with a PC you have a huge amount of choice for every component in your system. these choices include the really crappy brands. you can ignorantly put together a system with a 2 GHz processor, and 100MHz system bus, 5400 rpm IDE hard drive, 64M RAM at 100MHz, and you will never see your processors speed. you can get an ethernet card that won t properly negotian it s IRQ with the system board, and fail to work. then you can watch windows 98 struggle to make it all work. oops windows doesn t have a driver for your video card? sorry. or you can get apple to sell you a machine where the OS is taylored to your hardware. and with apple, you know you re getting good hardware. new technologies like firewire(1394), wireless (802.11), and gigabit ethernet (i don t know the ieee no for that one! how embarrassing!).
there was a time when apple lisenced out it s architecture, for about 3 years, about 10 years ago. then you could buy clones from UMAX and motorola, prices were cheaper, and you had more options, including the option to get cheaper hardware. but steve came back and took care of that situation. apple software on apple hardware. it has it s pros and cons, but i for one like what apple is doing these days.