The article analyzes the development schemes of the host computer interface card , the adapter principle of the printer and reasons of selecting it . having studied signals of printer ports further , thus i determined the communication mode between the host computer and the slave computer , and designed communication circuit . the question of programming has been discussed 论文分析了上位机计算机接口卡的开发方案，并行打印机接口原理和选用它的原因，研究了打印机端口信号，决定了通信联络方式，设计出上位机通讯硬件电路，并研究了上位机编程问题。
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