#include <stdio.h> 
#include <unistd.h> 
#include <sys/io.h> 
#include <ncurses.h> 
int main ()
{
  int n=0; 
  int delay=5 e5; 
  ioperm(0x300,4,0x300); 
  outb(0x80,0x303); 
  initscr(); 
  cbreak(); 
  noecho(); 
  halfdelay(1); 
  do 
  {
    printf("0x55 \n\r"); 
    refresh(); 
    outb(0x55,0x300); 
    outb(0x55,0x301); 
    usleep(delay); 
    printf("0xAA \n\r"); 
    refresh(); 
    outb(0xaa,0x300); 
    outb(0xaa,0x301); 
    usleep(delay); 
    n=getch(); 
    }
  while(n<=0); 
  endwin(); 
  return 0; 
  }