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Tru64 (not True64), which was originally DUnix (Digital Unix), is based on OSF/1 and is a 64-bit operating system. It was used and found on the Digital (Alpha) DEC platforms. Today Tru64 is a product and trademark of Hewlett-Packard.

Note: HP announced that Tru64 would stop being sold October 1, 2012; support ended December 31, 2012.

Also see: Operating system, Unix