VAX/VMS

operating system

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June 17, 2026

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VAX/VMS was an influential operating system developed by Digital Equipment Corporation (DEC) for their VAX computer line, introduced in 1978. VAX stands for Virtual Address eXtension, and VMS is the Virtual Memory System. This system was known for its robust virtual memory capabilities, allowing it to manage computer memory efficiently.1

The VAX and its VMS operating system became highly successful, offering a range of systems from desktop workstations to high-end computers that could rival IBM's mainframes. VMS gained popularity among software developers, leading to a large selection of available applications for VAX users. DEC also developed a version of the UNIX operating system for VAX to compete with other vendors. By 1990, VAX sales had propelled Digital Equipment Corporation to the second-largest computer sales position, behind IBM.1

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Minicomputers
…an advanced operating system called VAX/VMS—VMS standing for virtual memory system, an innovation that effectively expanded the memory of the machine by allowing disk or other peripheral storage to serve as extra memory. By this time (the early 1970s) DEC was vying with Sperry Rand (manufacturer of the UNIVAC computer)…
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…an advanced operating system called VAX/VMS—VMS standing for virtual memory system, an innovation that effectively expanded the memory of the machine by allowing disk or other peripheral storage to serve as extra memory. By this time (the early 1970s) DEC was vying with Sperry Rand (manufacturer of the UNIVAC computer)…
Read More