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Ultrix is a computer operating system of the Unix -family by Digital Equipment Corporation to run on their workstations.

Ultrix runs on DECstation[?] workstations, which are built atop MIPS R2000 and R3000 family of RISC processors, and on DEC VAX-machines.

It's basically a BSD 4.2, with some features from 4.3 and System V Release 2. It supports TCP/IP and DECnet networking and DEC's X window system called DECwindows[?].

The first version of Ultrix, 1.0, was released early 1980s, and the last version, 4.5, was released in November 1995. After this the DEC's Unix-product was DEC OSF/1 AXP[?], also known as Digital UNIX, which is an implementation of Open Software Foundation's OSF/1 for the DEC Alpha architecture.

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