On traditional parallel machines, users organize and manage the file system through command lineinterface, which makes users feel very inconvenient.
在传统的并行机上，用户通过命令行接口对文件系统进行组织和管理，这给用户带来了诸多的不便。
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The long line transmission technology of two-way parallelinterface bus of monolithic compnters is analysed and discussed. Solutions are given, which have high value in engineering applications.
Through analyzing the inner structure of the parallelinterface chip 8255A and some examined examples, this paper puts forward that the link of the 8255A address line is not unique.