打印机适配器端口直接编程: 通过系统并行口1,打印一行字符”HELLO”.并行口1的数据口地址为378H,命令口地址为37AH,状态口地址为379H. -direct printer port adapter programming : a parallel port system, Print his characters "Hello." a parallel port data I address 378H, I order to address 37AH,