portable scheme interpreter

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portable scheme interpreter - Free On-line Dictionary of Computing (26 May 2007) :

  Portable Scheme Interpreter
  PSI
  
     (PSI) A portable scheme interpreter by Ozan Yigit
     <oz@ursa.sis.yorku.ca>, David Keldsen and Pontus Hedman that
     includes a simple DAG compiler and a virtual machine.  It
     can be used as an integrated extension interpreter in other
     systems and allows easy addition of new primitives.  There are
     some unique debugging and tracing facilities.  Acceptable
     performance results from a fairly straight-forward
     implementation.  Continuations are fully and portably
     supported and perform well.  PSI is based on the simple
     compilers and virtual machine in Kent Dbyvig's thesis.
  
     The pre-release version conforms to R4RS with a number of
     useful extensions.
  
     (1993-02-19)