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In 1987 Borland purchased Wizard Systems and incorporated portions of the Wizard C technology into Turbo C. Bob Jervis, the author of Wizard C became a Borland employee.

Turbo C was released on May 18, 1987 and an estimated 100, 000 copies were shipped in the first month of its release.

This apparently drove a wedge between Borland and Niels Jensen and the other members of his team who had been working on a brand new series of compilers at their London development centre.

An agreement was reached and they spun off a company called Jensen & Partners International ( JPI ), later TopSpeed.

JPI first launched a MS-DOS compiler named JPI Modula-2, that later became TopSpeed Modula-2, and followed up with TopSpeed C, TopSpeed C ++ and TopSpeed Pascal compilers for both the MS-DOS and OS / 2 operating systems.

The TopSpeed compiler technology exists today as the underlying technology of the Clarion 4GL programming language, a Windows development tool.