INT 15 - Intel System Management Bus - REQUEST

	AX = 53B0h
	BH = 10h
	BL = protocol (see #00487)
	CH = device address
	CL = device command (see #00488)
	DH = MSB Data or block length (for BlockWrite)
	DL = LSB Data or first byte of block (for BlockWrite)
Return: CF clear if successful
	    AH = 00h or 80h (SMBus OK)
		 (80h indicates a previously unreported SMI took place)
	CF set if error
	    AH = error code (05h,10h,11h,12h,13h,14h,17h,19h,1Ah,86h)
		  (see #00484)
Desc:	request access to a device on the SMBus
SeeAlso: AX=53B0h/BH=11h, AX=53B0h/BH=13h