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编者按——象大多数主机厂家所证实的那样,解决I/O控制问题的合理方法是采用智能I/O子系统。Intel的8089使微型计算机系统实现了这种能力。
Editor’s Note - As is validated by most host manufacturers, a reasonable way to solve I / O control problems is to use an intelligent I / O subsystem. Intel’s 8089 enabled microcomputers to do that.