INT 15 - Intel System Management Bus - REQUEST DATA AND STATUS AX = 53B0h BH = 13h BL = protocol (see #00487) CH = device address CL = device command Return: CF clear if successful AH = 00h (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. OK) CH = status 00h no data pending, transaction complete 01h no data pending, transaction continues 02h data pending CL = number of valid bytes in DX (0-2) DH = MSB data DL = LSB data CF set if error AH = error code (05h,10h,11h,13h,15h,16h,18h,1Bh,86h) (see #00484) Desc: determine when a transaction is complete, gather data returned by read transactions Note: for Block Read protocol (08h), first call returns block length in DH and the first byte of the block in DL