{

protected SXB() { }

// terminal interface routines

public static char getChar() { return 0; }

public static void putChar(char c) { }

public static int getInt() { return 0; }

public static void putInt(int n) { }

public static void getString() { }

public static void putString(String text) { }

public static void controlTones(int freq1, int freq2,

boolean enable1, boolean enable2) { }