The last version of IRIX was 6.5.30, released in August 2006. IRIX development stabilized with IRIX 6.5, released in 1998. The Origin 2000 and Onyx2 IRIX 6.4 was marketed as "Cellular IRIX", although it only incorporated some features from the original Cellular IRIX distributed operating system project. IRIX 6.4 improved multiprocessor scalability for the Octane, Origin 2000, and Onyx2 systems. IRIX 6.3 was released for the SGI O2 workstation only. Later 6.x releases supported other members of the MIPS processor family in 64-bit mode. In 1994, IRIX 6.0 added support for the 64-bit MIPS R8000 processor, but was otherwise similar to IRIX 5.2. IRIX 5.3 introduced the XFS journaling file system. IRIX 5.0, released in 1993, incorporated certain features of UNIX System V Release 4, including ELF-format executables. IRIX 4.0, released in 1991, replaced 4Sight with the X Window System (X11R4), the 4Dwm window manager providing a similar look and feel to 4Sight. SGI's own Extent File System (EFS) replaced the System V filesystem. IRIX 3.x was based on UNIX System V Release 3 with 4.3BSD enhancements, and incorporated the 4Sight windowing system, based on NeWS and IRIS GL. The 4D1- prefix continued to be used in official documentation to prefix IRIX release numbers.
Previous releases were identified only by the release number prefixed by "4D1-", e.g.
#IRIX OS HISTORY SERIES#
The IRIX name was first used around the time of release 3.0 of the operating system for SGI's IRIS 4D series of workstations and servers, in 1988.
#IRIX OS HISTORY UPGRADE#
An overlay upgrade from 6.5.x to the 6.5.22 maintenance release is available as a free download, whereas versions 6.5.23 and higher require an active Silicon Graphics support contract, despite only running on Silicon Graphics hardware. Through version 6.5.22, there were two branches of each release: a maintenance release (identified by an m suffix to the version number) that included only fixes to the original IRIX 6.5 code, and a feature release (with an f suffix) that included improvements and enhancements. New minor versions of IRIX 6.5 were released every quarter until 2005 since then there have been four further minor releases. The last major version of IRIX was IRIX 6.5 which was released in May 1998. IRIX was the first operating system to include the XFS file system. It was based on UNIX System V with BSD extensions.
(SGI) to run natively on their MIPS architecture workstations and servers. IRIX is a computer operating system developed by Silicon Graphics, Inc. Retired (supported until December 2013) Ħ.5.30 / August 16, 2006 6 years ago ( )
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