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 Clear(){} = driver.clear;
public link void print_char(bit n1,bit n2){} = driver.print_char;
public link void ShowDot(){} = driver.show_dot;
public link void HideDot(){} = driver.hide_dot;
public link void SetLight(bit n1){} = driver.set_light;
