Wintel, that is, Intel x86 or compatible hardware and Windows operating system.
Lintel, that is, Intel x86 or compatible hardware and the Linux operating system.
x86 with other UNIX variants such as BSD variants.
RISC processor based machines running UNIX variants (for example, Sun computers running the Solaris operating system)
Macintosh, custom Apple Computer hardware and MacOS operating system.
Old home computer microcomputers.
A mainframe with its custom operating system, say an IBM System/360.