综合实验内容有2个方案：方案一，利用键盘显示控制器8279的键盘输入去控制并行I/O接口8255A的PB口输出。
Comprehensive experimental content with 2 options: Option One, using the keyboard display controller 8279 of the keyboard input to control the parallel I/O interfaces 8255A of the PB port output.
此种响铃器实际为一种可编程时间控制器，它提供定时控制输出接口，可方便地用于各种定时控制。
Such loud bell device reality is a kind of programmable time controller, it offers and controls and exports the interface regularly, can be used in various kinds of to control regularly conveniently.
采用工业控制专用的DSP芯片、集成的A/D和数字PWM控制输出接口，提高了数字控制器的速度和可靠性；
The special DSP chip for industrial control, integrated A/D and PWM interface increase the speed and reliability of the digital control system.
输出数据通过串行或并行端口从输出寄存器中存取，这可实现与现代微控制器和数字信号处理器的轻松、高速接口。
The output data is accessed from the output register through a serial or parallel port. This offers easy, high speed interfacing to modern microcontrollers and digital signal processors.
各传感器输出端经已编号的接口连接到控制器输入通道中相应的输入端。
Various sensors out-port already the serial number connection connects in the controller input channel the corresponding input end.
各传感器输出端经已编号的接口连接到控制器输入通道中相应的输入端。
Various sensors out-port already the serial number connection connects in the controller input channel the corresponding input end.
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