public link unit char {} = driver.char;
public link void OS_init(){} = driver.OS_init;
public link void OS_thread(){} = driver.OS_thread;
public link void (){} = driver.clear;
public link void ڵ_ʾַ_(bit n1,bit n3){} = driver.print_char;
public link void ʾʱӵ(){} = driver.show_dot;
public link void Ϩʱӵ(){} = driver.hide_dot;
public link void ĻΪ_(bit n1){} = driver.set_light;
