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Add 8 Bit BCD Numbers

May 4, 2011 by ProjectsGeek Leave a Comment

Add 8 bit BCD numbers

Add 8 Bit BCD Numbers is the program written in assembly language and describes the algorithm of adding two 8 bit BCD numbers through Assembly program code. This program will take numbers as input one by one and then add those BCD numbers. You can find complete steps and algorithm below step by step.
Algorithm :
Step I       :    Initialize the data memory.
Step II     :    Get the first BCD number in AL.
Step III   :    Get the second BCD number in BL.
Step IV    :    Add the two BCD numbers.
Step V     :    Using DAA, adjust result to valid BCD number.
Step VI    :    Display the result.
Step VII  :    Stop.
  Program : 

 

 .model small  
 .data  
 a db 09H                                                 
 b db 02H  
 .code  
     mov  ax, @data  ; Initialize data section  
     mov  ds, ax  
     mov  al, a       ; Load number1 in al  
     mov  bl, b      ; Load number2 in bl  
     add   al, bl      ; add numbers and result in al  
     daa            ; adjust result to valid BCD number    
     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  
   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  
   add   dl, 30H  
     mov  ah, 02         ; Function 2 under INT 21H (Display character)  
     int    21H  
     dec   ch        ; Decrement Count  
     jnz   l2  
     mov  ah, 4cH    ; Terminate Program  
     int    21H  
     end  

 

Other Projects to Try:

  1. BCD to 7 Segment Code Conversion
  2. Add Two 8 Bit Numbers Code Assembly Language
  3. Add Two 16 Bit BCD Numbers Code
  4. Multiply Two 8 Bit BCD Numbers
  5. Subtract 8 Bit BCD Numbers

Filed Under: Assembly Codes Tagged With: Assembly Codes

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