title: What does SHR on ASM mean
body: <p>I am confused as what SHR means,</p>
  
  <pre><code>SHR CL, 1
  </code></pre>
  
  <p>Initially CL was <code>0x2A</code> after being SHR it became <code>0x15</code>.</p>
  
  <blockquote>
    <p>SHR 42, 1 = 21</p>
  </blockquote>