说明：  经典的串口键盘控制芯片8279的介绍与编程指导，在进行单片机开发时最常用到的外围设备编程指南，非常全面，很有参考价值
(8279 introduction and programming guidance of the classic serial keyboard control chip peripherals Programming Guide, the most commonly used microcontroller development, very comprehensive and useful reference for)