Mask Upper Nibble

 

Write assembly programs to Mask Upper Nibble for that number should be loaded into the register and operation should be implemented on that loaded number .

• Calculated result should be displayed in the output .

Algorithm for Mask Upper Nibble:

Step I : Load the number in AL.

Step II : Mask the upper nibble.

Step III : Display result.

Step IV : Stop.

Program for Mask Upper Nibble:

 

 

 

 

.model small                           
 .data  
 a dw 0012H  
 .code  
      mov      ax, @data          ; Initialize data section  
      mov      ds, ax                                                                 
      mov      ax, a               ; Load number1 in ax  
      and      al, 0fh               ; mask upper nibble.Result in al  
      mov      ch, 02h          ; Count of digits to be displayed  
      mov      cl, 04h          ; Count to roll by 4 bits  
      mov      bh, al               ; Result in reg bh  
 l2:     rol      bh, cl               ; roll bl so that msb comes to lsb   
      mov      dl, bh               ; load dl with data to be displayed  
      and      dl, 0fH          ; get only lsb  
      cmp      dl, 09               ; check if digit is 0-9 or letter A-F  
      jbe      l4  
      add      dl, 07               ; if letter add 37H else only add 30H  
 l4:     add      dl, 30H  
      mov      ah, 02               ; Function 2 under INT 21H (Display character)  
      int      21H  
      dec      ch               ; Decrement Count  
      jnz      l2  
      mov      ah, 4ch  
      int      21h  
      end

 

Assembly programs