From Rosetta Code
True BASIC is an implementation of BASIC. Other implementations of BASIC.

True BASIC is the commercial version of the original BASIC by Kemeny and Kurtz. True BASIC formerly supported a few different platforms, but recent versions require Windows.

True BASIC started out as an ANSI BASIC-compliant compiler, with enhancements soon added to extend the functionality. The code is somewhat similar to old Microsoft BASIC code (i.e. BASICA and GW-BASIC), but is dissimilar enough that it requires translation. The True BASIC website offers a free "BASIC-to-True BASIC" converter to ease the process (and also a Fortran-to-True BASIC converter).

Rosetta Code seems to have no True BASIC-specific solutions.