|SunOS version||Release date||Code base||Description|
|Sun UNIX 0.7||1982||UniSoft UNIX v7||Bundled with 68000-based Sun-1 system|
|SunOS 1.0||1983||4.1BSD||Support for 68010-based Sun-1 and Sun-2 systems|
|SunOS 1.1||Apr 1984|
|SunOS 1.2||Jan 1985|
|SunOS 2.0||May 1985||4.2BSD||Introduced virtual file system (VFS) layer and the NFS protocol|
|SunOS 3.0||Feb 1986||4.2BSD + System V IPC||coincided with release of 68020-based Sun-3 series. Optional System V tape offered utilities and development libraries.|
|SunOS 3.2||Sep 1986||Same as 3.0, plus some 4.3BSD||First support for Sun-4 series|
|SunOS 3.5||Jan 1988|
|SunOS 4.0||Dec 1988||4.3BSD with System V IPC||New virtual memory system, dynamic linking, automounter, System V STREAMS I/O. Sun386i support.|
|SunOS 4.0.2||Sep 1989||Sun386i only|
|SunOS 4.0.3||May 1989|
|SunOS 4.0.3c||Jun 1989||SPARCstation 1 (Sun-4c) only|
|SunOS 4.1||Mar 1990|
|SunOS 4.1e||Apr 1991||Sun-4e only|
|SunOS 4.1.1||Mar 1990||Bundled with OpenWindows 2.0|
|SunOS 4.1.1B||Feb 1991|
|SunOS 184.108.40.206||Jul 1991|
|SunOS 4.1.1_U1||Nov 1991||Sun-3/3x only|
|SunOS 4.1.2||Dec 1991||Support for multiprocessor (SPARCserver 600MP) systems; first CD-ROM-only release|
|SunOS 4.1.3||Aug 1992|
|SunOS 4.1.3C||Nov 1993||SPARCclassic/SPARCstation LX only|
|SunOS 4.1.3_U1||Dec 1993|
|SunOS 4.1.3_U1B||Feb 1994||Earliest release for which Y2K compliance patches were available|
|SunOS 4.1.4||Nov 1994||Last release of SunOS 4|
|SunOS 5.x||Jun 1992 -||SVR4||See Solaris article|
SunOS 1 and 2 supported the Sun-2 series systems, including Sun-1 systems upgraded with Sun-2 (68010) CPU boards. SunOS 3 supported Sun-2 and Sun-3 (68020) series systems. SunOS 4 supported Sun-2 (until release 4.0.3), Sun-3 (until 4.1.1), Sun386i (4.0, 4.0.1 and 4.0.2 only) and Sun-4 (SPARC) architectures. Although SunOS 4 was intended to be the first release to fully support Sun's new SPARC processor, there was also a SunOS 3.2 release with preliminary support for Sun-4 systems.
SunOS 4.1.2 introduced support for Sun's first sun4m-architecture multiprocessor machines (the SPARCserver 600MP series); since it had only a single lock for the kernel, only one CPU at a time could execute in the kernel.
The last release of SunOS 4 was 4.1.4 (Solaris 1.1.2) in 1994. The sun4, sun4c and sun4m architectures were supported in 4.1.4; sun4d was not supported.
Sun continued to ship SunOS 4.1.3 and 4.1.4 until December 27, 1998; they were supported until September 30, 2003.
Read more about this topic: SunOS
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