View source for ULTRIX

{{Infobox OS 
| image = ultrix40.png
| caption = Logging into an Ultrix 4.0 system
| name = ULTRIX
| creator = [[Digital Equipment Corporation]]
| current version = 4.5 for VAX and DECStation (1995)
| year introduced = ULTRIX-11: 1982, ULTRIX-32: 1984
| type = Multi-tasking, multi-user Unix
| architecture = [[PDP-11]], [[VAX]], [[DECStation]]/[[DECsystem]] ([[RISC]])
}}

'''ULTRIX''' was [[Digital Equipment Corporation|DEC]]'s official [[UNIX]] for [[VAX]], [[PDP-11]] and [[DECStation]]/[[DECsystem]] ([[RISC]]) equipment.

==PDP-11==

'''ULTRIX-11''' was available for the PDP-11 and can be obtained up to version 3.1 from the [[The Unix Heritage Society|TUHS]] archive (below). It will run under [[SIMH]] (and other PDP-11 emulators).

These are the known ULTRIX-11 versions and predecessors:
* 1981: Unix/v7m V2.1
* 1982/83: V7M-11 V1.0 (= ULTRIX-11 V1.0)
* 1984: ULTRIX-11 V2.0
* 1986: ULTRIX-11 V3.0
* 1987: ULTRIX-11 V3.1 (last version)

==VAX== 

'''ULTRIX-32''' (from version 4.0 onwards called: '''ULTRIX/VAX''') for the VAX was derived from [[4.2 BSD]] with some influences from [[UNIX System V|SYSV]] and included support for specific DEC technologies. The latest version is 4.5 from 1995. Earlier versions of ULTRIX-32 are available from TUHS. It will run under the VAX simulator in SIMH.

Timeline of the main VAX versions:
* 1984: V1.0
* 1986: V2.0
* 1988: V3.0
* 1990: V4.0

===ULTRIX-32 / ULTRIX-32m===

During the V1.x phase there were special versions of ULTRIX-32 for the [[MicroVAX]] computers called '''ULTRIX-32m''' (similar to the relationship between [[VMS]] and [[MicroVMS]]).

The two types of ULTRIX-32 differed by:
* Distribution media ([[RX50]]/[[TK50]]) instead of 9-track [[magnetic tape]]
* Supported [[bus]] types, e.g. [[QBUS]] (MicroVAX) versus [[UNIBUS]] resp. [[VAX Bus Interconnect|VAXBI]] (VAX)
* Supported [[controller]]s and [[peripheral|peripheral devices]]
* Scope of software tools
* Manuals

The prices were adjusted to the level of MicroVAX software as well.

It is not known whether there were any V2 versions of ULTRIX-32m, too.

==DEC MIPS-based Computers== 

ULTRIX/RISC for DECstation and DECsystem computers is not available from TUHS.  The latest version is 4.5 from 1995.  This version will also run, (Including CDE + X11!) under [[GXemul]].

==Y2K compatibility==

It's been confirmed that 4.0 is NOT Y2K compatible...  Not many UNIX from the 1990's or prior are so it's really no surprise...

==Running ULTRIX==

SIMH will run Ultrix.  Many simulators -if not all- of supported VAX computers are known to work.

Installation instructions for SIMH can be found at:
* [[Installing ULTRIX-11 V1.0 on SIMH]]
* [[Installing Ultrix V1.1 on SIMH]]
* [[Advanced Installation of Ultrix V2.0 on SIMH]]
* [[Setting Up RIS on ULTRIX V2.0]]
* [[Installing and Configuring an ULTRIX V3.0 DMS Server on a SIMH MicroVAX 3900]]
* [[Installing Ultrix 4.0 on SIMH]]
* [[Installing Ultrix 4.5 on SIMH]]

==See also==

* [[ULTRIX Diskless Mangement Services]]
* [[ULTRIX Remote Console]]

==External links==

* [https://www.tuhs.org/Archive/Distributions/DEC/ DEC] - various ULTRIX distros
** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=Ultrix-3.1 Ultrix-3.1] - PDP-11 version
*** [https://minnie.tuhs.org/cgi-bin/utree.pl?file=Ultrix-3.1/sys/sas/README ULTRIX-11 V3.0 changes to stand-alone system] - useful kernel documentation
* [ftp://ifctfvax.harhan.org/pub/UNIX/thirdparty/Ultrix-32/sources/ Ultrix-32] - Sourcecode for Ultrix-32

{{Nav Unix}}

[[Category: PDP-11 Operating Systems]]
[[Category: VAX Operating Systems]]
[[Category: DEC Operating Systems]]
[[Category: Unix-based OS's]]
[[Category: ULTRIX]]