Turbo Pascal is a software development system that includes a compiler and an integrated development environment (IDE) for the Pascal programming language running on CP/M, CP/M-86, and DOS, developed by Borland under Philippe Kahn's leadership. From version 6 both a lower-priced Turbo Pascal and more expensive Borland Pascal were produced; Borland Pascal had more libraries and standard library source code. The name Borland Pascal is also used more generically for Borland's dialect of Pascal.
Borland has released three old versions of Turbo Pascal free of charge because of their historical interest: the original Turbo Pascal (now known as 1.0), and versions 3.02 and 5.5 for DOS.

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