INT 15 - Intel System Management Bus - 16-BIT PROTECTED-MODE CONNECT            
	AX = 53B0h
	BH = 03h
	CX = 6941h ('iA')
Return: CF clear if successful
	    AX = 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. 16-bit code segment (real mode base address)
	    BX = offset of entry point into 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. BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. Interface
	    CX = 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. 16-bit data segment (real mode base address)
	    SI = code segment length in bytes
	    DI = data segment length in bytes
	CF set if error
	    AH = error code (01h,02h,0Ah,86h) (see #00484)
	    AL = sub-error code if error code is 02h (see #00485)
Desc:	connect to 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. interface; once connected, all 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. calls are made
	  to the supplied entry point instead of INT 15 (with registers
	  identical to those described here for INT 15)
Notes:	before calling the entry point, two descriptors must be initialized
	  in the GDT or LDT.  They must be consecutive and be in the order of
	  code, then data.  At the time	of the call, the descriptors must be
	  valid and have CPL=0.
	the code descriptor must be ring-0 privilege
	this function is only supported in INT 15 mode
SeeAlso: AX=53B0h/BH=01h,AX=53B0h/BH=02h,AX=53B0h/BH=04h,AX=53B0h/BH=05h