PC XT -> 286 -> 386 -> 486 -> Pentium -> MMX -> Celeron -> Celeron II -> Pentium
III
DOS 4.0 -> DOS 6.0 -> DOS 6.2 -> DOS 6.22 -> Windows 3.0 -> Windows 3.1 -> Windows 3.2 -> Windows 95 -> Windows 97 -> Windows 98 -> Window 98 SE -> Windows 2000 -> Window ME