Source : Free On-Line Dictionary of Computing

XScheme
     
         {Scheme} in {C} with {object-oriented} extensions
        by David Betz.
     
        Version 0.28 runs on {IBM PC}, {Macintosh}, {Atari} and
        {Amiga}.
     
        {(ftp://labrea.stanford.edu/comp.sources.amiga/volume90)}.
        {(ftp://nexus.yorku.ca/pub/scheme/)}.
     
        {Usenet} newsgroup: {news:comp.lang.lisp.x}.
     
        (1992-02-02)