8255扫描键盘、显示程序 利用8255可编程并行口做一个扫描键盘实验， 把按键输入的键码，显示在由8279控制的七段数码管上。 8255PA口做键盘输入线，PB口作扫描线。-8255 scanning keyboard, display program using 8255 parallel port programmable keyboard to do a scan experiment, the button input keys code, displayed in

有关键盘显示控制器8279应用实验和基本实验程序-Keyboard display controller 8279 on the application of basic experiments and experimental procedures