Int 1A Fn B18D  - Intel PCi BIOS V2.0c - Write Configuration Dword (32-bi  [X]

   AX = B18Dh
   BL = bus number
   BH = device/function number (bits 7-3 device, bits 2-0 function)
   DI = register number (multiple of 4 less than 0100h)
   ECX = dword to write

Return: as for AX=B10Dh

See Also: AX=B10Dh