During the 1990s and 2000s, there were approximately half a million VMS systems in operation worldwide. ==History== ===Origin and name changes=== In April 1975, Digital Equipment Corporation embarked on a hardware project, code named Star, to design a 32-bit virtual address extension to its PDP-11 computer line.
A companion software project, code named Starlet, was started in June 1975 to develop a totally new operating system, based on RSX-11M, for the Star family of processors.
It was first announced by Digital Equipment Corporation as VAX/VMS (Virtual Address eXtension/Virtual Memory System) alongside the VAX-11/780 minicomputer in 1977.
The Starlet name survived in VMS as a name of several of the main system libraries, including STARLET.OLB and STARLET.MLB. With the introduction of the MicroVAX range such as the MicroVAX I, MicroVAX II and MicroVAX 2000 in the mid-to-late 1980s, DIGITAL released MicroVMS versions specifically targeted for these platforms which had much more limited memory and disk capacity.
Digital began using OpenVMS VAX instead of VAX/VMS with the V6.0 release in June 1993. ===Port to DEC Alpha=== During the 1980s, Digital planned to replace the VAX platform and the VMS operating system with the PRISM architecture and the MICA operating system.
When these projects were cancelled in 1988, a team was set up to design new VAX/VMS systems of comparable performance to RISC-based Unix systems.
MicroVMS kits were released for VAX/VMS 4.0 to 4.7 on TK50 tapes and RX50 floppy disks, but discontinued with VAX/VMS V5.0. Beginning in 1989, a short lived distribution of VMS named Desktop-VMS was sold with VAXstation systems.
The project to port VMS to Alpha began in 1989, and first booted on a prototype Alpha EV3-based Alpha Demonstration Unit in early 1991.
During the 1990s and 2000s, there were approximately half a million VMS systems in operation worldwide. ==History== ===Origin and name changes=== In April 1975, Digital Equipment Corporation embarked on a hardware project, code named Star, to design a 32-bit virtual address extension to its PDP-11 computer line.
The project to port VMS to Alpha began in 1989, and first booted on a prototype Alpha EV3-based Alpha Demonstration Unit in early 1991.
Desktop-VMS had its own versioning scheme beginning with V1.0, which corresponded to the V5.x releases of VAX/VMS. In July 1992, Digital renamed VAX/VMS to OpenVMS as an indication for its support of "open systems" industry standards such as POSIX and Unix compatibility, and to drop the VAX connection since the port to Alpha was underway.
The OpenVMS name was first used with the OpenVMS AXP V1.0 release in November 1992.
Digital began using OpenVMS VAX instead of VAX/VMS with the V6.0 release in June 1993. ===Port to DEC Alpha=== During the 1980s, Digital planned to replace the VAX platform and the VMS operating system with the PRISM architecture and the MICA operating system.
In 1994, with the release of OpenVMS V6.1, feature (and version number) parity between the VAX and Alpha variants was achieved, this was the so-called Functional Equivalence release.
During the 1990s and 2000s, there were approximately half a million VMS systems in operation worldwide. ==History== ===Origin and name changes=== In April 1975, Digital Equipment Corporation embarked on a hardware project, code named Star, to design a 32-bit virtual address extension to its PDP-11 computer line.
The Starlet name survived in VMS as a name of several of the main system libraries, including STARLET.OLB and STARLET.MLB. With the introduction of the MicroVAX range such as the MicroVAX I, MicroVAX II and MicroVAX 2000 in the mid-to-late 1980s, DIGITAL released MicroVMS versions specifically targeted for these platforms which had much more limited memory and disk capacity.
Galaxy supported dynamic resource allocation to running partitions, and the ability to share memory between partitions. ===Port to Intel Itanium=== In 2001, just prior to its acquisition by Hewlett-Packard, Compaq announced the port of OpenVMS to the Intel Itanium architecture.
The porting began in late 2001, and the first boot on took place on the 31st of January 2003.
The porting began in late 2001, and the first boot on took place on the 31st of January 2003.
Two pre-production releases, OpenVMS I64 V8.0 and V8.1, were available on June 30, 2003 and on December 18, 2003.
The first production release, V8.2, was released in February 2005.
Since 2014, OpenVMS is developed and supported by a company named VMS Software Inc.
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