为充分利用CPU的运行效率，采用中断功能设计并行输入输出接口，以达到缓解CPU高速运行速度与外设低速缓冲间的矛盾。-To take full advantage of the efficiency of CPU operation, interruption of functional design using parallel input-output interface, in order to alleviate the CPU speed and high-speed peripherals contradictions between low-speed buffer.