STI - Set Interrupt Flag (Enable Interrupts)


	Usage:	STI
	Modifies flags: IF


	Sets the Interrupt Flag to 1, enabling recognition of all CPU
	hardware interrupts.


				 Clocks			Size
	Operands	 808x  286   386   486		Bytes

	none		  2	2     2	    5		  1


	- see Instruction Timing