Page "X Window System" Paragraph 119

A group at Brown University ported version 9 to the IBM RT / PC, but problems with reading unaligned data on the RT forced an incompatible protocol change, leading to version 10 in late 1985.

By 1986, outside organizations had begun asking for X. X10R2 was released in January 1986, then X10R3 in February 1986.

Although MIT had licensed X6 to some outside groups for a fee, it decided at this time to license X10R3 and future versions under what became known as the MIT License, intending to popularize X further and, in return, hoping that many more applications would become available.

X10R3 became the first version to achieve wide deployment, with both DEC and Hewlett-Packard releasing products based on it.

Other groups ported X10 to Apollo and to Sun workstations and even to the IBM PC / AT.

Demonstrations of the first commercial application for X ( a mechanical computer-aided engineering system from Cognition Inc. that ran on VAXes and remotely displayed on PCs running an X server ported by Jim Fulton and Jan Hardenbergh ) took place at the Autofact trade show at that time.

The last version of X10, X10R4, appeared in December 1986.