title: What would happen if the CS segment register is changed? (And how would you do so?)
body: <p>I read this article: <a href="http://static.patater.com/gbaguy/day3pc.htm" rel="nofollow">http://static.patater.com/gbaguy/day3pc.htm</a></p>
  
  <p>It includes the sentence</p>
  
  <blockquote>
    <p>DON'T EVER CHANGE CS!!</p>
  </blockquote>
  
  <p>But what exactly would happen if you did modify the <code>CS</code> segment register?  Why is it so dangerous?</p>