Int 1A Fn B106  - Pci Bios V2.0c+ - Pci Bus-specific Operations            [X]

   AX = B106h
   BL = bus number
   EDX = Special Cycle data

Return: CF clear if successful
   CF set on error
   AH = status (00h,81h) (see #0653)
   EAX, EBX, ECX, and EDX may be modified
   all other flags (except IF) may be modified

Note:  this function may require up to 1024 byte of stack; it will not enable
     interrupts if they were disabled before making the call

See Also: AX=B186h,INT 2F/AX=1684h/BX=304Ch