while((inportb(0x3fd)&0x20)==0); //条件1
    outportb(0x3f8,ilead1+20);                
    while((inportb(0x3fd)&0x20)==0);  //
    outportb(0x3f8,ilead2+30); 当条件1满足的时候,程序是否一直在前两句?