当CPU要从外设输入信号或者输出信息给外设，可以采用程序查询方式、中断方式和DMA方式。但是，不论采用哪一种方式，CPU总是通过接口电路(Interface)才能与外设连接。所以，接口电路一边与CPU连接，另一边与外设连接。-dsdsds

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The AS400 is an average IBM machine. Horizontal size of Unix machines. The latest name of the AS400 is the IBM Iseries (I = Integrated), which is integrated because it is sold with all the pre-installed programs. The AS400 is aimed at mid-market comp