51RTOS,一个国人写的51小型系统，非常不错，贡献给喜欢底层的朋友，以前学51，懂得点皮毛，自己觉得这还是不错的-51RTOS, one of 51 people to write mini-system, very good contribution to the bottom like a friend, before the school 51, know how to point fur, feel this is a good