Turbo Prolog

Turbo Prolog is a quite old Prolog system that only works with MS-DOS. This implies serious memory limitations. Also, it uses a special Prolog dialect with typed variables and some other restrictions that does not comply with the Edinborough Standard . However, it is very fast, and contains a convenient visual debugger. I once learned Prolog by observing this debugger...

Today it is more advisable to use SWI or Quintus Prolog, given the memory and processing resources of todays computers and the fact that these Prolog variants are considered standard. Please check the detailed comparison of current Prolog system.

A sample Turbo Prolog DOS window