Virtual Memory System - definizione. Che cos'è Virtual Memory System
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Cosa (chi) è Virtual Memory System - definizione

COMPUTER OPERATING SYSTEM
Virtual Memory System; Openvms; Vax/vms; VAX/VMS; DECwindows; Open VMS; Open vms; VMS (operating system); DECWindows; VMS Software Inc; OpenVMS 7.2; MicroVMS; DEC VMS; VMS operating system; VAX-VMS; Spiralog
  • VAXstation 4000 model 96 running OpenVMS V6.1, DECwindows Motif and the [[NCSA Mosaic]] browser
  • OpenVMS Alpha V8.4-2L1, showing the DCL CLI in a terminal session
  • The architecture of the OpenVMS operating system, demonstrating the layers of the system, and the access modes in which they typically run
  • VWS 4.5 running on top of VAX/VMS V5.5-2
  • Stylized "VAX/VMS" used by Digital
  • DECwindows XUI window manager running on top of VAX/VMS V5.5-2
  • The "Grey Wall" of VAX/VMS documentation, at [[Living Computers: Museum + Labs]]
  • access-date=January 24, 2021}}</ref>

Virtual Memory System         
<operating system> (VMS) DEC's proprietary {operating system} originally produced for its VAX minicomputer. VMS V1 was released in August 1978. VMS was renamed "OpenVMS" around version 5.5. The first version of VMS on DEC Alpha was known as OpenVMS for AXP V1.0, and the correct way to refer to the operating system now is OpenVMS for VAX or OpenVMS for Alpha. The renaming also signified the fact that the X/Open consortium had certified OpenVMS as having a high support for POSIX standards. VMS is one of the most secure operating systems on the market (making it popular in financial institutions). It currently (October 1997) has the best clustering capability (both number and distance) and is very scalable with binaries portable from small desktop workstations up to huge mainframes. Many Unix fans generously concede that VMS would probably be the hacker's favourite commercial OS if Unix didn't exist; though true, this makes VMS fans furious. {FAQ (http://cis.ohio-state.edu/hypertext/faq/bngusenet/comp/os/vms/top.html)}. Usenet newsgroup: news:comp.os.vms. [How does its performance compare with other OSes?] (1999-06-03)
DECwindows         
DEC's windowing environment based on the X Window System.
OpenVMS         

Wikipedia

OpenVMS

OpenVMS, often referred to as just VMS, is a multi-user, multiprocessing and virtual memory-based operating system. It is designed to support time-sharing, batch processing, transaction processing and workstation applications. Customers using OpenVMS include banks and financial services, hospitals and healthcare, telecommunications operators, network information services, and industrial manufacturers. During the 1990s and 2000s, there were approximately half a million VMS systems in operation worldwide.

It was first announced by Digital Equipment Corporation (DEC) as VAX/VMS (Virtual Address eXtension/Virtual Memory System) alongside the VAX-11/780 minicomputer in 1977. OpenVMS has subsequently been ported to run on DEC Alpha systems, the Itanium-based HPE Integrity Servers, and select x86-64 hardware and hypervisors. Since 2014, OpenVMS is developed and supported by VMS Software Inc. (VSI). OpenVMS offers high availability through clustering — the ability to distribute the system over multiple physical machines. This allows clustered applications and data to remain continuously available while operating system software and hardware maintenance and upgrades are performed, or if part of the cluster is destroyed. VMS cluster uptimes of 17 years have been reported.