#include <stdio.h>
#include <conio.h>
#include <bios.h>
#include "serutil.h"



void main ( void )
{
 char key;

 clrscr();

   while ( ( key = getch() ) != 27 )
   {
     if ( ser_WriteByte( 1, 0xFF, 1, 0, 0 ) != 0 )
                                  printf ( "\n Error !!! " );
   }

}