#define TBUF_SIZE	256		/* DO NOT CHANGE */
#define RBUF_SIZE	256		/* DO NOT CHANGE */

static xdata unsigned char tbuf [TBUF_SIZE];
static xdata unsigned char rbuf [RBUF_SIZE];

static xdata unsigned char t_in = 0;
static xdata unsigned char t_out = 0;
static xdata unsigned char t_disabled = 0;

static xdata unsigned char r_in = 0;
static xdata unsigned char r_out = 0;