INT 15 U - HP 100LX/200LX - SET POWER OFF TIMEOUT                               
	AH = 46h
	BX = timeout value in ticks
	    0000h inhibit auto power off
Note:	the 200LX default timeout is 0CCDh = 3277 ticks = approx. 3 min.
SeeAlso: AH=45h"HP",AH=47h"HP"