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Tru64 UNIX
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<p>Tru64 UNIX is a discontinued <a href="/facts/64-bit/AgvkQHkM">64-bit</a> <a href="/facts/UNIX/0pNL2seI">UNIX</a> <a href="/facts/Operating_system/8XTuvMh2">operating system</a> for the <a href="/facts/DEC_Alpha/4eN7LuXG">Alpha</a> <a href="/facts/Instruction_set_architecture/8p8vwUeE">instruction set architecture</a> (ISA), currently owned by <a href="/facts/Hewlett-Packard/abuNSYNu">Hewlett-Packard</a> (HP). Previously, Tru64 UNIX was a product of <a href="/facts/Compaq/6LuhWTE7">Compaq</a>, and before that, <a href="/facts/Digital_Equipment_Corporation/ztxs6keA">Digital Equipment Corporation</a> (DEC), where it was known as Digital UNIX (originally DEC OSF/1 AXP). </p><p>As its original name suggests, Tru64 UNIX is based on the <a href="/facts/OSF/1/mck5Bgyq">OSF/1</a> operating system. DEC's previous UNIX product was known as <a href="/facts/Ultrix/NWH3Udfj">Ultrix</a> and was based on <a href="/facts/BSD/XQKcURrh">BSD</a>. </p><p>It is unusual among commercial UNIX implementations, as it is built on top of the <a href="/facts/Mach_kernel/rqK8DES2">Mach kernel</a> developed at <a href="/facts/Carnegie_Mellon_University/XKd7L2KA">Carnegie Mellon University</a>. (Other UNIX and <a href="/facts/UNIX-like/YAKrAxzd">UNIX-like</a> implementations built on top of the Mach kernel are <a href="/facts/GNU_Hurd/LU1mHe5M">GNU Hurd</a>, <a href="/facts/NeXTSTEP/eL0bymga">NeXTSTEP</a>, <a href="/facts/MkLinux/CSW7v9sh">MkLinux</a>, and <a href="/facts/Darwin_(operating_system)/DogI3ptd">Darwin</a>.) </p><p>Tru64 UNIX required the <a href="/facts/SRM_firmware/J0XUewrp">SRM</a> boot <a href="/facts/Firmware/62UVKIUK">firmware</a> found on Alpha-based computer systems. </p>