程序段1.c

王为青 刘变红 编著《C语言高级编程及实例剖析》源代码

/* Note:Your choice is C IDE */
char bus;
char device;
unsigned int ioa0,iod;
int scan()
{
	bus=0;device=0;
	for(char i=0;i<5;i++)
	{
		for(char j=0;j<32;j++) 
		{
			bus=i; 
			device=j;
			ioa0=0x80000000+bus*0x10000+(device*8)*0x100;
			_outpd(0xcf8,ioa0);
			iod=_inpd(0xcfc);
			if (iod0= =0x905410b5) 
				return 0;
		}
	}
	retrn -1
}