INVD - Invalidate Cache (486+ only)

	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


	- see Instruction Timing