Virtual Pascal

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Virtual Pascal
Original author(s) Vitaly Miryanov
Developer(s) Allan Mertner
Initial release 1995; 29 years ago (1995)[1]
Stable release 2.1.279 / May 13, 2004; 19 years ago (2004-05-13)
Development status unmaintained
Written in Object Pascal and Assembler
Operating system Microsoft Windows, OS/2, Linux
Type Compiler, Integrated Development Environment
License Freeware
Website vpascal.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 1990s, VP has not evolved significantly since 2001, and after a few maintenance-only releases the owner declared in 2005 that development had ceased.[1] Virtual Pascal was developed by Vitaly Miryanov and later maintained by Allan Mertner.

Features

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 (in theory)
  • 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 is integrated directly into the IDE and is reminiscent of Turbo Debugger
  • Fast compilation
  • Tool-chain written mostly in Intel assembly

History

The compiler was quite popular in the BBS scene, probably because of its OS/2 port and being one of the few affordable multi-target compilers. Also Turbo Pascal had been popular in the BBS scene too, but its successor, Delphi was suddenly for Windows only. Virtual Pascal provided a migration path for existing codebases.

There has been pressure from some users for Virtual Pascal to be made into open-source software. This has not been done, provided the following reasoning:

  • The compiler source is mostly written in Intel assembly which is hard to change and maintain.
  • Part of the run-time library is proprietary to Borland (The FreePascal run-time library was ported to VirtualPascal by Noah Silva, however newer versions of the FreePascal RTL use features of the FreePascal compiler which are not supported by VirtualPascal, and so can not be ported).
  • The patch/diff tool to work around the above (provide changes to proprietary without distributing parts of the original) was proprietary and (win)16-bit only.
  • Documentation and help are 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)

References

  1. ↑ 1.0 1.1 Virtual Pascal: News Mon Apr 4, 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

External links

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