最简单的p1口流水灯，适合刚刚接触C51的初学者。第1个程度为延时程度，第2个为主程度。-most simple p1 I wasted lights, just contact C51 for beginners. The first level of a delay, its two main levels.

步进电机的控制，用C51编的，本人测试可用-Stepper motor control, with the C51 series, I test available. . .