INT 15 - HP 95LX - ENABLE/DISABLE LIGHT SLEEP                                   
	AH = 4Eh
	AL = light sleep
	    00h disabled
	    01h enabled
Note:	when light sleep is disabled, the system will continue running at full
	  speed; when enabled, it may automatically slow to conserve batteries
SeeAlso: INT 06"HP 95LX",INT 60/DI=0100h