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static volatile char *data = (char *)(0x20);
static volatile char *control = (char *)(0x24);
 
extern void _outb (volatile char*, unsigned char);
extern unsigned char _inb (volatile char*);
 
static unsigned char
 read_scc_reg (unsigned char n)
{
  _outb (control, n);
  return _inb(control);
}
 
static void write_scc_data (unsigned char n)
{
  _outb (data, n);
}
 
int
_write (int dev, void *buf, unsigned int len)
{
  int i;
  char *string = (char*)buf;
 
  for (i = 0; i < len; i++) 
    {
      int j;
 
      for (j = 0 ; j < 5000; j++)
	;
      write_scc_data (string[i]);
 
    }
  return len;
}