一种实用的AT总线I/O口的扩展电路

A Practicable Expanded Circuit of I/O Interface with AT Bus

本文通过分析ＡＴ总线Ｉ／Ｏ口的功能，总结出在应用于工业控制时Ｉ／Ｏ口扩展的一般方法。并给出一个通用的扩展电路。

Analysing the function of I/O interface with AT bus, the paper summarizes a general method of expanding I/O interface for industrial control, and gives a general purpose expanded circuit.