title: Does the mov instruction move data from register to memory
body: <p>I wanted to know if when you use the <code>mov</code> instruction from register to memory in a loop, does it overwrite what is already in the memory location each time or does it just add to it?</p>
  
  <p>For example, if the <code>al</code> register contains '2', and you move it to a memory location and then you do it again but this time <code>al</code> register contains '9', does the memory location now contain '9' or '29'. </p>