_main ()
	{
	main ();
	}

main ()
	{
	for (;;)
		{
		static char c; 

		c = cpm (6, ~0);	/* input */

		if (c == 0)
			continue;	/* no char. ready  yet */
			
		if (c == 3)		/* control C */
			cpm (0);

		cpm (6, c);		/* send the char back */
		}
	}