VSI Pascal

VSI Pascal (formerly HP Pascal for OpenVMS[1], Compaq Pascal, DEC Pascal, VAX Pascal and originally VAX-11 Pascal[2]) is a Pascal and Extended Pascal compiler that runs on OpenVMS for VAX systems, OpenVMS for AlphaServer systems, and OpenVMS for Integrity servers.[3]. It was also supported under Tru64.[4][5]

VSI Pascal is compatible with standardized unextended Pascal as well as Extended Pascal, with its own extensions. The compiler frontend is implemented in BLISS.[6] The VAX compiler used its own code generator[7], whereas the Alpha and Itanium compilers use Digital's proprietary GEM backend.[6]

References
  1. "HP Pascal for OpenVMS User Manual" (PDF).
  2. "VAX-11 Pascal V1.0 User's Guide" (PDF).
  3. "VSI Products - Pascal".
  4. "Interview with a Pascal Architect - Compaq Pascal".
  5. "Compaq Pascal Version 5.8 for Tru64 UNIX Software Product Description".
  6. "VSI's John Reagan Interview on GEM vs. LLVM for X86/64".
  7. "comp.os.vms - VAX VMS going forward".

Further reading
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