计算机内部之间和计算机与外设之间的通讯都是靠总线完成的。总线以ＣＰＵ为中心，ＣＰＵ通过地址总线对内存，计算机内部端口和外设端口寻址定位，再通过数据总线和控制总线进行信息传递和通讯协调。我们可以利用这种总线技术对计算机系统各环节的故障进行定位，这种定位可以准确到各具体芯片或分立元件。这一原理具有坚实完备的理论基础，实行起来也简单方便，可望为电脑工程师们的计算机系统的检测和维修维护工作提供最大的帮助。 Communication between computers and between computers and peripherals is done by bus. Bus to the CPU as the center, CPU address bus memory, internal computer ports and peripherals port addressing positioning, and then through the data bus and control bus for information transfer and communication coordination. We can use this bus technology to locate faults in all aspects of the computer system, this positioning can be accurate to the specific chip or discrete components. This principle has a solid and complete theoretical basis, is also simple and convenient to implement, and is expected to help computer engineers detect and repair computer systems to provide the greatest help.