INT 61 - Atari Portfolio - GET KEY/NMI-INVOKED SCREEN REFRESH                   
	AH = 1Fh
	AL = function
	    00h get state
	    01h set state
		DH = new refresh-on-NMI state
		    (00h disabled, 01h enabled, bit 7 set = don't change)
		DL = new refresh-on-key state
Return: DH,DL = current/old states
SeeAlso: AH=00h"Portfolio",AH=1Eh"Portfolio",AH=20h"Portfolio"