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本文介绍一种特别适用于高校“接口技术”实验教学的低成本的IBM/PC与APPLE-Ⅱ两用A/D卡的设计原理,解决了并行接口8255A难以和APPLE-Ⅱ时序匹配的问题,从而实现了在一块A/D卡上取得两用的效果。
This paper introduces a design principle of low-cost IBM / PC and APPLE-Ⅱ dual-purpose A / D card which is especially suitable for the experimental teaching of “interface technology” in colleges and universities. It solves the problem that the parallel interface 8255A is difficult to match the APPLE- In this way, the dual-purpose effect can be achieved on an A / D card.