Mt xinu

mt Xinu (Unix tm, reversed) was a company that developed several UNIX distributions from 1983 onward. The principals were University of California, Berkeley computer science students/graduates, notably Bob Kridle, Alan Tobey, Ed Gould, and Vance Vaughan. Debbie Scherrer was a later contributor. Distributions included more/4.2BSD and more/4.3BSD.

Reference: "A Quarter Century of UNIX", p. 209, Peter Salus, Addison-Wesley, pubs. ISBN 0–201–54777–5

Note that there is also a computer operating system named "Xinu" (possibly "Xinu Is Not UNIX") developed by Douglas Comer for instructional purposes, at Purdue University in the early to mid-1980s.

Reference: http://www.cs.purdue.edu/people/dec and http://www.cs.purdue.edu/homes/dec/osbooks.html