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In 1988, during the so-called "Unix wars", DEC joined with IBM, HP and others formed the Open Software Foundation (OSF) to develop a version of Unix to compete with AT&T and Sun Microsystems. OSF/1 was one of the first operating systems to use the Mach kernel developed at Carnegie Mellon University, and is probably best known as the root of the third major branch of the Unix family tree, after System V and BSD.
In 1994, after the Unix wars had splintered the Unix market, the Open Software Foundation ceased funding of research and development of OSF/1.
After the OSF gave up on OSF/1, DEC renamed it Digital UNIX and made it the main operating system for the company's Alpha processors. It was 64-bit and retained the basis on the Mach kernel but with components from BSD, System V and other sources.
After Compaq's purchase of DEC, Digital UNIX was renamed to Tru64 to emphasise its 64-bit-clean nature.
With HP's purchase of Compaq, HP announced the intention to migrate many of Tru64's more unique features (including its file system) to HP-UX, HP's proprietary Unix. As of December 2004, however, HP appears to have cancelled this project, instead choosing to use the Veritas file system and abandon the rest of the Tru64 advanced features. In the process, many of the remaining Tru64 developers have been laid-off (made redundant).
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