OpenVMS is a closed-source, proprietary computer operating system for use in general-purpose computing. It is the successor to the VMS Operating System (VAX-11/VMSVAX/VMS), that was produced by Digital Equipment Corporation, and first released in 1977 for its series of VAX-11 minicomputers. The 11/780 was introduced at DEC’s Oct. 25, 1977 annual shareholder’s meeting. In the 1990s, it was used for the successor series of DEC Alpha systems. OpenVMS also runs on the HP Itanium-based families of computers. As of 2018, a port to the x86-64architecture is underway.The name VMS is derived from virtual memory system, according to one of its principal architectural features. OpenVMS is a proprietary operating system, but source code listings are available for purchase.
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