: This paper makes a brief introduction to the structure of the hardware system of the input and output cards in the microcomputer detecting and controlling system and has designed interface card circuits for fault diagnosis. It is proposed that, in connection with the two circuits, the digital circuits card testing should be divided into four levels, i.e. the whole card level, the function block level, the single chip level and the function output terminal level, and by coding the functional output termina...
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