title: How to disable screen in Commodore 64?
body: <p>I know this question is very spesific question but I know there are some c64 code gurus around here. So, here is my question.</p>
  
  <p>When I try to disable screen using $d011 trick, upper/lower border also opens. I want to do that without opening upper/lower borders. Is it possible?</p>