OpenVMS

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Open Virtual Memory System (OpenVMS)[1], initially known just as Virtual Memory System (VMS), is the name of a high-end computer server operating system that runs on the VAX[2] and Alpha[3] families of computers, developed by Digital Equipment Corporation of Maynard, Massachusetts (DEC was later purchased by Compaq, and is now owned by Hewlett-Packard), and most recently on Hewlett-Packard systems built around the Intel Itanium[4] CPU.

OpenVMS is a multi-user, multiprocessing virtual memory-based operating system (OS) designed for use in time sharing, batch processing, real time (process priorities can be set higher than OS kernel jobs) and transaction processing. It offers high system availability through clustering, or the ability to distribute the system over multiple physical machines. This allows the system to be "disaster-tolerant" against natural disasters that may disable individual data-processing facilities. VMS also includes a process priority system that allows for real-time process to run unhindered, while user processes get temporary priority "boosts" if necessary.[5][6][7][8]

OpenVMS and the Emulator

See Building the Emulator on OpenVMS, Configuring the Emulator for OpenVMS, and Running OpenVMS in the Emulator

Discontinuation Notice

ES40 emulator development has virtually been halted since 2009. The lead developer of ES40, Camiel Vanderhoevenis developing both Freeware and Commercial Alpha and VAX emulators for Migration Specialties.
FreeAXP is the Freeware Alpha emulator from Migration Specialties.
Avanti is the Freeware Alpha emulator from Migration Specialties.

References

  1. See the OpenVMS Software Product Description (SPD) documents for OpenVMS VAX, OpenVMS Alpha, and OpenVMS I64; see the SPD repository
  2. VAX Architecture Reference Manual
  3. http://ftp.digital.com/pub/Digital/info/semiconductor/literature/dsc-library.html DIGITAL Microprocessor and Alpha Architecture Library
  4. Intel Itanium documentation
  5. OpenVMS Alpha Internals and Data Structures : Scheduling and Process Control : Version 7.0, Ruth Goldenberg, Saro Saravanan, Denise Dumas, ISBN 1-55558-156-0
  6. OpenVMS Alpha Internals and Data Structures: Memory Management, Ruth Goldenberg, ISBN 1-55558-159-5
  7. VAX/VMS Internals and Data Structures: Version 5.2 ("IDSM"), Ruth Goldenberg, Saro Saravanan, Denise Dumas, ISBN 1-55558-059-9
  8. OpenVMS Alpha Internals and Data Structures : Scheduling and Process Control : Version 7.0, Ruth Goldenberg, Saro Saravanan, Denise Dumas, ISBN 1-55558-156-0