编写程序，以8279为键盘显示核心，按下小键盘按键0～F，可在实验机的LED数码管上对应显示0～F，按F键、RST键或HALT键结束-Preparation procedures in order to show that the core of 8279 as the keyboard, press the keypad keys 0 ~ F, testing machine in the digital tube LED display on the corresponding 0 ~ F, by F key, RST key or key Ending HALT