Source : Free On-Line Dictionary of Computing

Power Macintosh
     
         {Apple Computer}'s {personal computer} based on the
        {PowerPC}, introduced on 1994-03-14.  Existing {680x0} code
        (both applications and device drivers) run on Power Macintosh
        systems without modification via a {Motorola 68LC040}
        {emulator}.  The performance of these unmodified applications
        is equivalent to a fast {68040}-based Macintosh, e.g. a fast
        {Macintosh Quadra}.  The Power Macintosh runs {Macintosh
        operating system} from {System 7.5} to {Mac OS} 8.5.
     
        {Home (http://www.info.apple.com/ppc/ppchome.html)}.
     
        (1999-01-08)