title: writing 8086 assembly program that uses INT 21H in dos
body: <p><strong>I need to write 8086 assembly program that do the following :</strong> 
  -Reads 2 numbers from the keyboard 
  -Display the summation of those numbers </p>
  
  <p><strong>The hints I got till now :</strong> 
  The keyboard will store the ASCII code in a register &amp; I will read it 
  I need to use some ISR(interrupt service routine ) called <strong>INT 21H</strong></p>
  
  <p><strong>The tools I will use :</strong> 
  Microsoft assembler </p>
  
  <p><strong>An example of the code template is :</strong> </p>
  
  <pre><code>.model small
  .stack 100h
  .data
  .code
  .exit 
  .end 
  </code></pre>
  
  <p>, note <code>.exit</code> is equivalent to </p>
  
  <pre><code>mov AH,4CH
  INT 21H
  </code></pre>
  
  <p>My question is how to do it , the assembler doesn't have any GUI , don't know how to compile it and make .exe from it , in general can you solve it with explain ??</p>