Bitfields for Compaq SLT/286 power conservation status:
Bit(s)	Description	)
 0	power source (0 internal, 1 external)
 1-2	low battery state
	00 no low battery condition
	01 low battery 1
	10 reserved
	11 low battery 2
 3-4	power conservation mode
	00 automatic, 01 on, 10 off, 11 reserved