WBINVD - Write-Back and Invalidate Cache (486+)

        Usage:  WBINVD
        Modifies flags: None

        Flushes internal cache, then signals the external cache to write
        back current data followed by a signal to flush the external cache.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              -     -     -     5             2


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