[comp.lang.prolog] Modifiable Prolog Implementation Sought

zachary%denali.utah.edu@cs.utah.edu (Joe Zachary) (09/13/90)

I'm looking for a public domain Prolog interpreter, preferably written in
C, that can be easily understood and modified by students.  The interpreter
need neither be efficient nor adhere to any particular language standard.
Transparency is the key here.  Any help will be greatly appreciated.