#include <stdio.h>
#include <conio.h>

#define BUFSIZE 0x20

typedef unsigned char near *charptr;
typedef unsigned charptr far *ptrptr;
typedef unsigned char far *bufptr;

bufptr buf = (bufptr)0x0000041EL;

ptrptr head = (ptrptr)0x0000041AL, tail = (ptrptr)0x0000041CL;

void main(void)
{
  int i, j;
  for (j=0; j<20; j++)
    for (i=-32767; i<32767; i++);

  for (i=0; i<BUFSIZE-2; i++) buf[i] = 0;
  buf[0] = 'a';
  *head = (charptr) buf;
  *tail = (charptr) (buf+2);
}