IBM—PC 微型计算机及其兼容微机已大量应用于过程控制,由于该机型可供用户使用的中断源很少,因此,必须扩展中断源.本文介绍了两种行之有效的中断扩展方法:母子式扩充法和简捷扩充法.母子式扩充法能将中断源无限扩展,简捷扩充法不需要加中断控制器便能使中断源成倍增加.这两种方法能满足对中断源的各种要求. IBM-PC microcomputers and their compatible microcomputers have been extensively used in process control, and because of the small number of interrupt sources available to the user, interrupt sources must be extended.This article describes two proven methods for extending an interrupt: The mother-child expansion method and the simple expansion method.The mother-child expansion method can limit the infinite expansion of sources, simple expansion method does not require interrupt controller can increase the interrupt source multiplied.These two methods to meet the various interrupt sources Claim.