Int1Ah AX = B10Dh(在PCI表面配置空間上，寫入DWord) -- BIOS Int1Ah

WRITE CONFIGURATION DWORD (32-bit)


Input:
AX = B18Dh
BH = bus number
BL = 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: 
CF clear if successful
CF set on error
AH = status (00h,87h) (see PCI BIOS v2.0 status codes)
EAX, EBX, ECX, and EDX may be modified
all other flags (except IF) may be modified
Note:

the meanings of BL and BH on return were exchanged between the initial drafts of the specification and final implementation