title: How to get user input in assembly
body: <p>I want to get the number entered by the user into a register. This is my own OS. So, I cannot use this:</p>
  
  <pre><code>mov al,0x01
  int 0x21
  mov dl,al ;move the integer entered by the user, into dl
  </code></pre>
  
  <p>since int 0x21 calles ms-dos. So what interuppt can I use?</p>