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Multiply Two 8 Bit Numbers in Assembly Language

May 4, 2011 by ProjectsGeek Leave a Comment

Multiply Two 8 Bit Numbers in Assembly Language

Write a program to Multiply Two 8 Bit Numbers in assembly language . Program should load first number and second number in registers AL and BL registers . Then it should implement some logic for multiplication of two numbers .

 

Consider that a byte of data is present in the AL register and second byte of data is present in the BL register.
We have to multiply the byte in AL with the byte in BL.
Using MUL instruction, multiply the contents of two registers.
The multiplication of two 8 bit numbers may result into a 16 bit number. So result is stored in AX register.
The MSB is stored in AH and LSB in AL.      
                  
For example :
AL = 09 H
09 H
BL = 02 H
´
02 H
0012 H

Algorithm to Multiply Two 8 Bit Numbers

Step I       :    Initialize the data segment.
Step II      :    Get the first number in AL register.
Step III    :    Get the second number in BL register.                                     
Step IV    :    Multiply the two numbers.
Step V      :    Display the result.
Step VI    :    Stop 

 

Multiply Two 8 Bit Numbers in Assembly Language 1

 

Program to Multiply Two 8 Bit Numbers

 

.model small  
 .data                                                                   
 a db 09H  
 b db 02H  
 .code  
      mov      ax, @data           ; Initialize data section  
      mov      ds, ax  
      mov      ah, 0  
      mov      al, a               ; Load number1 in al  
      mov      bl, b               ; Load number2 in bl  
      mul      bl                  ; multiply numbers and result in ax  
      mov      ch, 04h             ; Count of digits to be displayed  
      mov      cl, 04h             ; Count to roll by 4 bits  
      mov      bx, ax              ; Result in reg bx  
 l2:     rol      bx, cl           ; roll bl so that msb comes to lsb   
      mov      dl, bl              ; 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             ; Terminate Program  
      int      21H  
      end

How to Run this Program

For Running this program you should have installed Tasm on you computer . If you have not installed Tasm  yet please install from Here .

C:\>tasm 8bit-mul.asm
Turbo Assembler  Version 3.0  Copyright (c) 1988, 1991 Borland International
Assembling file:   8bit-mul.asm
Error messages:    None
Warning messages:  None
Passes:            1
Remaining memory:  438k
C:\>tlink 8bit-mul.obj
Turbo Link  Version 3.0 Copyright (c) 1987, 1990 Borland International
Warning: No stack
C:\>8bit-mul
0012

Other Projects to Try:

  1. Multiply Two 8 Bit Numbers Successive Addition Method
  2. Multiply Two 8 Bit Numbers using Add and Shift Method
  3. GCD of Two Numbers program in Assembly Language
  4. Subtract Two 8 Bit Numbers Code Assembly Language
  5. Add Two 8 Bit Numbers Code Assembly Language

Filed Under: Assembly Codes Tagged With: Assembly Codes

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