Int 1A Fn B103  - Pci Bios V2.0c+ - Find Pci Class Code                    [X]

   AX = B103h
   ECX = class code (see also #F059,#0798)
       bits 31-24 unused
       bits 23-16 class
       bits 15-8  subclass
       bits 7-0   programming interface
   SI = device index (0-n)

Return: CF clear if successful
   CF set on error
   AH = status (00h,86h) (see #0653)
       00h successful
       BH = bus number
       BL = device/function number (bits 7-3 device, bits 2-0 func)
       86h device not found
   EAX, EBX, ECX, and EDX may be modified
   all other flags (except IF) may be modified

Notes: this function may require up to 1024 byte of stack; it will not enable
     interrupts if they were disabled before making the call
   the meanings of BL and BH on return were exchanged between the initial
     drafts of the specification and final implementation
   all devices sharing the same Class Code may be enumerated by
     incrementing SI from 0 until error 86h is returned

See Also: AX=B183h