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 ʾ_С(bit n1){} = driver.show_point;
public link void ص_С(bit n1){} = driver.hide_point;
public link void ȫС(){} = driver.clear_point;
public link void ĻΪ_(bit n1){} = driver.set_light;
