X386 was an implementation of the X Window System for IBM PC compatible computers. It ran on systems with Intel 386 or later processors, running Unix System V-based operating systems, and supported a variety of VGA-compatible graphics cards. X386 was created by Thomas Roell while at Technische Universität München and first released in 1991. X386 1.2 was incorporated in the X11R5 release later the same year.