INT 15 - HP OmniShare - Pen Driver - STORE PEN BATTERY CHARGE                   
	AX = BA12h
	BL = new battery state (00h good, 01h low charge)
Return: CF set on error
	CF clear if successfully stored in CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption.
Note:	The last report will be displayed by the Power-On Self Test the next
	  time the OmniShare boots.  This allows something meaningful to be
	  reported even if the pen is not detected during the POSTsee Power-On Self-Test.
SeeAlso: AX=BA13h