[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fF-YSjQRYmpN0K_YOanBNCqHNFqE06HEX7r7-vrwAH9o":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":65},[],"2023-11-06 18:57:43",103736849,[8,9,10,11],"只要一启动I\u002FO设备,CPU便不断查询I\u002FO设备的准备情况,从而终止了原程序的执行","CPU执行程序与I\u002FO设备做准备是同时进行的,不会出现"踏步"现象","I\u002FO设备准备就绪后,若从I\u002FO设备取出数据,经CPU送至主存,此刻CPU也不能执行原程序","CPU和IO设备处于串行工作状态,CPU的工作效率不高",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},6,"12ff3cb83988e7d866e5c4492c159f28","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F28b4f85104160b4a75b7a3bfe251d5dd.jpg","计算机原理--2023-2024（1）","06d5fe72b19448e79c12570ce337daa1","第5章 章节测验1","关于程序查询方式的特点,下列说法正确的是()",[21,32,38,47,56,66],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],103736840,[25,26,27,28],"程序中断方式","DMA方式","程序查询方式","三种方式都是","当主机发生I\u002FO操作时,CPU和IO外设串行工作的控制方式是()","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":37,"source":30,"type":31},[],103736842,[25,27,26,36],"三种方式都需要","当内存和外设之间进行信息传输时,不需要CPU参与的控制方式是()",{"answer":39,"createTime":5,"id":40,"options":41,"question":46,"source":30,"type":31},[],103736843,[42,43,44,45],"不统一编址是指将I\u002FO地址看作是存储器地址的一部分,可用专门的I\u002FO指令对设备进行访问","不统一编址是指I\u002FO地址和存储器地址是分开的,所以对I\u002FO访问必须有专门的I\u002FO指令","统一编址是指I\u002FO地址和存储器地址是分开的,所以可用访存指令实现CPU对设备的访问","统一编址就是将I\u002FO地址看作是存储器地址的一部分,可用专门的I\u002FO指令对设备进行访问","I\u002FO编址方式可分为统一编址和不统一编址,下列对这两种方法叙述正确的是()",{"answer":48,"createTime":5,"id":49,"options":50,"question":55,"source":30,"type":31},[],103736846,[51,52,53,54],"是I\u002FO设备与主机之间数据代码的传送线,它通常是双向的,也可以是单向的","主要用以传输CPU向设备发送的各种命令信号","是将I\u002FO设备的状态向主机报告的信号线,例如,设备是否准备就绪,是否向CPU发出中断请求等","是用来传送设备码的,它的根数取决于I\u002FO指令中设备码的位数","下面()是对状态线的描述",{"answer":57,"createTime":5,"id":58,"options":59,"question":64,"source":30,"type":65},[],103736848,[60,61,62,63],"将数据从I\u002FO设备输入主机","形成某些操作命令","逻辑运算","状态测试","I\u002FO 指令的命令码一般可以表述的情况有()",1,{"answer":67,"createTime":5,"id":6,"options":68,"question":19,"source":30,"type":65},[],[8,9,10,11]]