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Virtual Pascal

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Virtual Pascal
Original author(s)Vitaly Miryanov
Developer(s)Allan Mertner
Stable release
2.1.279 / 2004-05-13
Written inObject Pascal and Assembler
Operating systemMicrosoft Windows, OS/2, Linux
TypeCompiler, Integrated Development Environment
LicenseFreeware
Websitevpascal.com (archived), Online community

Virtual Pascal is a free 32-bit Pascal compiler, IDE and debugger for OS/2 and Microsoft Windows, with some limited Linux support. Although it had a wide user base in the late nineties, VP has not evolved significantly for several years, and the owner declared in 2005 that development had ceased[1]. Virtual Pascal was developed by Vitaly Miryanov and later maintained by Allan Mertner.

There has been pressure from some users for the compiler source to be made into open-source software. This has not been done, the main reasons being:

  • The compiler source is mostly written in Intel assembly and is complex and hard to maintain, adapt and stabilize after change.
  • Part of the run-time library is proprietary to Borland
  • Documentation and help is maintained with expensive proprietary tools
  • There is nobody who fully understands the code. Alan said that some of the deeper areas were no-touch for him (original code by Vitaly)

The compiler is compatible with Turbo Pascal, Borland Delphi and Free Pascal, although language- and RTL-compatibility is limited for features introduced after Delphi v2 and FPC 1.0.x. VP was primarily useful for the following purposes:

  • Easily port existing 16-bit Turbo Pascal programs to 32 bits
  • Port existing 16-bit OWL programs to 32-bit Windows
  • Write console (text-mode) programs for several platforms
  • Pascal development using the 32-bit Windows API (the classic development, no COM!)
  • Learn object-oriented programming

Significant features of Virtual Pascal include:

  • Text-mode IDE
  • Debugger of VP is built directly into the IDE and is reminiscent of Turbo Debugger
  • Fast compilation
  • Tool-chain written mostly in Intel assembly

References

  1. ^ Virtual Pascal: News Mon 04 Apr 2005 - 01:21:43 - "Virtual Pascal has died" I don't know if anyone has noticed, but I am sad to report that Virtual Pascal has died a quiet death. It was born in 1995, and died in 2005 at the ripe old age (for software) of 10 years."

See also

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