They even released the C++ version as public domain. Free Pascal uses it's own Free Vision which is back port of the TUI support into Graphics Vision[1] (which

They even released the C++ version as public domain. Free Pascal uses it's own Free Vision which is back port of the TUI support into Graphics Vision[1] (which in turn is LGPL's reimplementation of Turbo Vision API in graphical mode) [1] https://www.math.ucdavis.edu/~mkoeppe/mkm/mkmeng.html https://www.math.ucdavis.edu/~mkoeppe/mkm/mkmeng.html