Turbo Pascal is a Environnement of development integrated for the Langage PASCAL. Its power and its democratic price made its success. The compiler was based on the compiler Blue Label Pascal in the beginning writes in 1981 by Anders Hejlsberg for the computer Nascom with the Operating system to NasSys cassette. It was rewritten under the name of Compass Pascal for the operating system CP/M, then it took the name of Poly Pascal (according to the company Poly Data from Hejlsberg) before being bought by Borland and produced for the systems DOS and CP/M.

When the first version of Turbo Pascal PC compatible appeared in 1983, the concept of Environnement of Development Integrated (EDI) was relatively unknown. That, more power of the Compiler and its speed (a master key to compile), to which one adds the low price charged by Borland (49,95 $ in 1983) created a real success and ran the compiler Microsoft Pascal (sold in the 500 $).

Thanks to a not-redundant management of the error messages, the code was of a great compactness so that the compiler as the editor (full-screen) can remain permanently in Random access memory: 16 K bytes. The absence of use of the disc made in addition compilations very fast.

It should be added that the codes produced by the compiler were free rights. Microsoft intended on the contrary to claim rights on these codes because they included necessarily modules of the library developed by Microsoft.

During years, Borland improved EDI but also the Computer programming language.

• With version 4 appears a On line help in Hypertexte, since which one can copy and stick the examples in the editor of development.

• version 5 makes it possible to clearly separate in each module the part interface of the part implementation and makes it possible each module to have its clean initializations , which increases the Lisibilité considerably programs.

• With version 5.5, appears the Programmation object.

The last version of Turbo Pascal was called Borland Pascal 7 and contained EDI and compilers to create programs wide MS-DOS and DOS and Windows 3.x. It functioned under Windows.

In 1995, Borland gave up Turbo Pascal and replaced it by the environment Fast development of applications (RAD) Delphi, which included the object language Pascal. The current version of Delphi still supports all enrichments of the Pascal of the first products as well as “the old” model object.

Borland Turbo Pascal remains still very much used, especially in education…