INT 15 - Intel System Management Bus - RESERVED                                 
	AX = 53B0h
	BH = 00h
Program: the SMBus(System Management Bus) A derivative of the I2C bus used for communication between various components of a computer, such as smart batteries and their chargers.  In contrast to I2C, SMBus specifies fixed voltage levels (instead of relative to the power supply voltage) and a 10 KHz minimum clock rate (I2C minimum is 0).  SMBus also specifies several timings which are not required by I2C.  See also I2C, ACCESS.bus. is a variant of ACCESS.busA further development of the I2C bus which forms the physical layer of the Universal Serial Bus.  Because ACCESS.bus is used for communication with external devices, it includes power and ground wires in addition to I2C's clock and data lines, and permits twice the current draw (6ma) on the clock and data lines.	see also I2C, SMBus. being used by Intel and Duracell
	  for the Smart Battery proposal, but designed to be generic enough to
	  handle other devices besides batteries