Store and Retrieve a number from memory in 8086 assembly language -

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I am starting a total for the 8086 assembly language, I want to try some simple stuff first to write a program To enter a number, say x , store it in memory and then load it into a register later, and display it?

I did something like this: 

 . Smallen the model. Data NL2DB 0 AH, 0H, 'Enter a number:', '$' .CODE Main Process MOV C, 100D LEA DX, NL2; MOV AH, 09H; INT 21H MOV AH, 0H; Read in Buffer MOV [SI]; 0h; Store in memory MOV BX, [si]; MOV BX to load from memory, 09H; Display it INT 21H EXIT main ENDP main   
 What's the mistake? Please help me! Thanks!   
 
 
 There are two mistakes in the code above  
     
  1.  
      $  should be in the quote otherwise the error may occur.   
  2.  
     After input, give us the value of  mov   al  in  dl , on the screen To print the value made.

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