INT 17 U - Emulaser ELTSR - GET TRUE ScrlLk STATE                               
	AH = 0Dh
Return: AX = state (0000h off, 0010h on)
Desc:	determine the actual state of ScrlLk even when Emulaser is controlling
	  the ScrlLk light as its activity indicator
SeeAlso: AH=0Ch,INT 16/AH=02h,INT 1A/AH=E5h