title: MOV instruction between 16 and 8 bits in my code
body: <p>I just started learning Assembly Lagrange and I need some helps.</p>
  
  <p>For the following instructions:
  1- Can I use MOV between different registers size?
  2- In the last line, how AX became 47AFH?</p>
  
  <p>Let assume the address 2000H contains 47H and 2001H contains AFH</p>
  
  <pre><code>MOV BX, 2000H   ;load BX with address
  MOV AL, [BX]    ;places 47H into AL
  MOV AX, [BX]    ;places 47AFH into AX
  </code></pre>