INVD - Invalidate Cache  (486+)

        Usage:  INVD
        Modifies flags: none

        Flushes CPU internal cache.  Issues special function bus cycle
        which indicates to flush external caches.   Data in write-back
        external caches is lost.
        
                                  Clocks                Size
        Operands         808x   286   386   486         Bytes

        none              -      -     -     4            2


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