Int 15 Fn 53B0  - Intel System Management Bus - Get Device Addresses       [X]

   AX = 53B0h
   BH = 06h
   BL = position in list to report
   CH = 6941h ('iA')

Return: CF clear if successful
       AH = 00h (SMBus OK)
       BH = number of SMBus devices
       BL = SMBus Device Address of device at position BL in list
       (see #0412)
   CF set if error
       AH = error code (06h,0Ah,86h) (see #0410)
Desc:  retrieves already assigned SMBus device addresses

Notes: this function is supported in INT 15h mode only
   bit 0 of the device address indicates read/write, so a device may
     be listed at both xxxxxxx0b and xxxxxxx1b

(Table 0412)
Values for System Management Bus predefined device addresses:
 10h   SMBus host
 12h   Smart Battery charger
 14h   Smart Battery selector
 16h   Smart Battery
 18h   SMBus Alert response
 50h   ACCESS.bus host
 58h   LCD contrast controller
 5Ah   CCFL backlight driver
 6Eh   ACCESS.bus default address
 80h-86h PCMCIA socket controllers
 88h   VGA graphics controller
 90h-96h unrestricted addresses
 82h   SMBus device default address