INT 1A - PCI BIOS v2.0c+ - PCI BUS-SPECIFIC OPERATIONS

	AX = B106h
	BL = bus number
	EDX = Special Cycle data
Return: CF clear if successful
	CF set on error
	AH = status (00h,81h) (see #00729)
	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
SeeAlso: AX=B186h,INT 2F/AX=1684h/BX=304Ch