INT 15 - Intel System Management Bus - INSTALLATION CHECK                       
	AX = 53B0h
	BH = 01h
	BL = 72h ('r')
	CX = 6164h ('ad')
Return: CF clear if installed
	    AH = 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 Specification major version (01h)
	    AL = 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 Specification minor version (00h)
	    BL = number of 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. devices present
	    CX = 6941h ('iA')
	    DX = vendor-specified 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. hardware code
		0000h means undefined hardware type
	CF set if error
	    AH = Error code 0Ah, 86h (see #00484)
Note:	this function is only supported in INT 15h mode
SeeAlso: AX=53B0h/BH=02h,AX=53B0h/BH=03h,AX=53B0h/BH=04h,AX=53B0h/BH=06h
SeeAlso: #01105 at INT 1A/AX=B10Ah/SF=8086h


(Table 00484)
Values for Intel System Management Bus error codes:
 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
 01h	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. connect failed
 02h	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. already connected (see also #00485)
 03h	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. disconnect failed
 04h	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. not connected
 05h	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. INT 15 interface disabled
 06h	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. device address request out of range
 07h	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. unknown failure
 08h	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. message list empty
 09h	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. message list overflow
 0Ah	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. invalid signature
 10h	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. device address not acknowledged
 11h	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. device error detected
 12h	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. device command access denied
 13h	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. unknown error
 14h	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. transaction pending
 15h	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. no transaction pending
 16h	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. request does not match pending transaction
 17h	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. device access denied
 18h	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. timeout
 19h	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. protocol not supported
 1Ah	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. busy
 1Bh	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. SMI detected
 80h	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 (previously unreported SMI occurred)
 86h	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. not supported


(Table 00485)
Values for Intel System Management Bus Already Connected sub-error codes:
 01h	real mode connect already established
 02h	16-bit PMode connect already established
 03h	32-bit PMode connect already established
SeeAlso: #00484