IN - Input Byte or Word From Port

	Usage:	IN	accum,port
	Modifies flags: None


	A byte, word or dword is read from "port" and placed in AL, AX or
	EAX respectively.  If the port number is in the range of 0-255
	it can be specified as an immediate, otherwise the port number
	must be specified in DX.  Valid port ranges on the PC are 0-1024,
	though values through 65535 may be specified and recognized by
	third party vendors and PS/2's.


				 Clocks			Size
	Operands	 808x  286   386    486		Bytes

	accum,immed8	10/14	5     12     14		  2
	accum,immed8 (PM)	     6/26  8/28/27  	  2
	accum,DX	 8/12	5     13     14		  1
	accum,DX (PM)		     7/27  8/28/27  	  1


	- 386+ protected mode timings depend on privilege levels.

	  first number is the timing if:    CPL ó IOPL
	  second number is the timing if:   CPL > IOPL or in VM 86 mode (386)
	  			     	    CPL ò IOPL  (486)
	  third number is the timing when:    virtual mode on 486 processor
	- 486 virtual mode always requires 27 cycles

	- see Instruction Timing