mt Xinu (from the letters in "Unix™", reversed) was a software company founded in 1983 that produced two operating systems. Its slogan "We know Unix™ backwards and forwards" was an allusion to the company's name and abilities.
mt Xinu offered several products:
- mt Xinu was a commercially licensed version of the BSD Unix operating system for the DEC VAX. The initial version was based on 4.1cBSD; later versions were based on 4.2 and 4.3BSD.
- more/BSD was mt Xinu's version of 4.3BSD-Tahoe for VAX and HP 9000, incorporating code from the University of Utah's HPBSD. It included NFS.
- Mach386 was a hybrid of Mach 2.5/2.6 and 4.3BSD-Tahoe/Reno for 386 and 486-based IBM PC compatibles.
The company's principals were University of California, Berkeley computer science students and graduates, notably Bob Kridle, Alan Tobey, Ed Gould, and Vance Vaughan. Debbie Scherrer was a later contributor.
mt Xinu is also famous for its light-hearted Unix-themed calendars, including:
- Command of the Month (1987–1988)
- Lessons in Art (1989)
- Platform of the Year (1990)
In 1991 a division of mt Xinu broke off to become Xinet.