VAXELN

VAXELN
DeveloperDigital Equipment Corporation
Written inPascal
Working stateDiscontinued
Source modelClosed source
Initial release1982; 42 years ago (1982)[1]
Final release4.6 / May 1996; 28 years ago (1996-05)[2]
Marketing targetEmbedded systems, real-time systems
Available inEnglish
PlatformsVAX family
Kernel typeMonolithic
Default
user interface		Command-line interface
LicenseProprietary

VAXELN (typically pronounced "VAX-elan")[3][4] is a discontinued real-time operating system for the VAX family of computers produced by the Digital Equipment Corporation (DEC) of Maynard, Massachusetts.[5]

As with RSX-11 and VMS, Dave Cutler was the principal force behind the development of this operating system.[3] Cutler's team developed the product after moving to the Seattle, Washington area to form the DECwest Engineering Group; DEC's first engineering group outside New England. Initial target platforms for VAXELN were the backplane interconnect computers such as the V-11 family. When VAXELN was well under way, Cutler spearheaded the next project, the MicroVAX I, the first VAX microcomputer. Although it was a low-volume product compared with the New England-developed MicroVAX II, the MicroVAX I demonstrated the set of architectural decisions needed to support a single-board implementation of the VAX computer family, and it also provided a platform for embedded system applications written for VAXELN.

The VAXELN team made the decision, for the first release, to use the programming language Pascal as its system programming language. The development team built the first product in approximately 18 months. Other languages, including C, Ada, and Fortran were supported in later releases of the system as optional extras. A relational database, named VAX Rdb/ELN was another optional component of the system.[6] Later versions of VAXELN supported an X11 server named EWS (VAXELN Window Server).[7] VAXELN with EWS was used as the operating system for the VT1300 X terminal,[8] and was sometimes used to convert old VAXstation hardware into X terminals.[9] Beginning with version 4.3, VAXELN gained support for TCP/IP networking and a subset of POSIX APIs.[10]

VAXELN allowed the creation of a self-contained embedded system application that would run on VAX (and later MicroVAX) hardware with no other operating system present. The system was debuted in Las Vegas in the early 1980s, with a variety of amusing application software written by the development team, ranging from a system that composed and played minuets to a robotic system that played and solved the Tower of Hanoi puzzle.[11]

VAXELN was not ported to the DEC Alpha architecture, and instead was replaced with a Digital-supported port of VxWorks to Alpha, and a VAXELN application programming interface (API) compatibility layer for that platform.[1][12] In 1999, SMART Modular Technologies acquired Compaq's (formerly Digital's) embedded systems division, which included VAXELN.[1][13]

  1. ^ a b c "[Info-vax] History of VMS and related operating systems". 2015-01-31. Retrieved 2021-01-15.
  2. ^ "VAXELN Toolkit, Version 4.6". Digital. May 1996. Retrieved 2021-01-15.
  3. ^ a b Cutler, Dave (2016-02-25). "Dave Cutler Oral History". youtube.com (Interview). Interviewed by Grant Saviers. Computer History Museum. Retrieved 2021-02-26.
  4. ^ Cite error: The named reference vaxeln-overview was invoked but never defined (see the help page).
  5. ^ Myles F. Connors Jr. (1985-05-30). "Announcing VAXELN 2.0" (PDF). Digital. Retrieved 2021-11-02.
  6. ^ "VAXELN 2.2 Brochure" (PDF). bitsavers.trailing-edge.com. 1986. Retrieved 2020-11-12.
  7. ^ "VAXELN Window Server User's Guide". Digital. October 1991. Retrieved 2021-11-01.
  8. ^ "VT1300 Terminal" (PDF). Digital. 1990. Retrieved 2021-11-01.
  9. ^ Gus Altobello (1991-02-19). "What to do with VS2000's". Newsgroup: eisner.decus.org. Retrieved 2021-11-01.
  10. ^ Jim Duffy (1991-12-23). "DEC adds TCP/IP, POSIX support to real-time wares". Network World. p. 11. Retrieved 2021-12-08.
  11. ^ Tom Diaz (2015-01-31). "History of VMS and related operating systems". Newsgroup: comp.os.vms. Retrieved 2021-11-02.
  12. ^ "VxWorks Realtime Tools for Alpha, Version 3.2". Digital. July 1995. Retrieved 2021-01-17.
  13. ^ "SMART Modular Technologies, Inc. to Acquire Compaq's Embedded Computer Product Line" (PDF). SMART Modular Technologies. 1999-08-19. Retrieved 2021-01-17.