Apple's Mac OS X is legally only used on Apple Macintosh computers.
Mac OS X is the OS used on Apple's Macintosh computers.
Mac OS X (ten)
Mac OS
Mac OS
Apple's Mac OS X can legally only be used on Apple's Macintosh range of personal computers.
Mac OS X
Mac OS
Computers made by Apple, called Macs, use the Macintosh OS.
No. The Apple II predated the Macintosh by several years.
Apple created Mac OS X to run on their Macintosh range of computers. The licencing agreement that you agree to when installing Mac OS X specifies that it can only be used on Apple's own hardware.
The Apple Macintosh operating system is called Mac OS X.
Apple produces the Mac OS for their range of Macintosh computers.