import utmech.mechanompu.io.*;
import utmech.mechanompu.*;

public class SerialEchoback {
    
    public static void main(String arg[]) {
        System.out.println("serial echoback");
        System.out.print("(^C->end): ");
        while(true) {
            int c;
            c=serial.in.read();
            serial.out.write(c);
            System.out.write(c);
            if (c==0x02 || c==0x03) // ^c or ^D
                break;
        }
    }
}