Do the flowchart and write a program for a subroutine to do

Do the flowchart and write a program for a subroutine to do multiplication of 2 binary numbers smaller that 15, received via memory positions $1000 and $1001 , and the result should be on $1002. DO NOT USE MUL.

Do by checking each bit, and testing bit : if it is 1, sum and shift left, if it is 0, just shift.

Do not forget to check for the case when one of the received parameters are 0.

(a) do the flowchart

(b) do the code , commented and with header.

You can use subroutines or macros, but use just on of them

Do the flowchart please

Solution

Iam giving answer in assembly language program using instruction of 8086

since iam finding difficulty in drawing the flow chart iwill give u in sentences

step1:enter the two numbers num1 and num2

step2:move the num1 to ax register and num2 to bx register

step3:clear the contents of dx register to save the result using instruction xor dx,dx

step4:rotate the contents of bx register inordrer to check wheatheer the bit is 0 or 1

step5:check whether the bit is 1 or 0 i.e.,if carry then the bit is 1 otherwise 0

step6:if jc i.e., if carry then add the contents of ax to dx and shift the contents of dx one time left

step7:if no carry then just shift the contents of dx once

step8:then verify the count stored in cx if zero thenmove the result to location $1001and exit otherwise jump to step 4 and cotinue till it is zero.

here is the assembly language program

In this Assembly Language Programming, A single program is divided into four Segments which are 1. Data Segment, 2. Code Segment, 3. Stack Segment, and 4. Extra Segment. Now, from these one is compulsory i.e. Code Segment if at all you don’t need variable(s) for your program.if you need variable(s) for your program you will need two Segments i.e. Code Segment and Data Segment.

Data segment

NUM1 DB ?
     NUM2 DB ?
     RESULT DB ?
     MSG1 DB 10,13,”ENTER FIRST NUMBER TO MULTIPLY : $”
     MSG2 DB 10,13,”ENTER SECOND NUMBER TO MULTIPLY : $”  
data ends

CODE SEGMENT

    ASSUME DS:DATA CS:CODE

START:

      MOV AX,DATA    ;initilizing data segment.

      MOV DS,AX

     

      LEA DX,MSG1;getting the number from keyboard

      MOV AH,9

      INT 21H

     

      MOV AH,1

      INT 21H

      SUB AL,30H

      MOV NUM1,AL

       MOV ax,NUM1

     

      LEA DX,MSG2

      MOV AH,9

      INT 21H

     

      MOV AH,1

      INT 21H

      SUB AL,30H

      MOV NUM2,AL

                    MOV BX,NUM2

XOR DX,DX

MOV CX,04H

L1;ROR BX,01H

JC L1

ADD AX,DX

L1:SHL DX,01H

CMP CX,00H

JZ L2

MOV RESULT,DX

INT 21H

ENDS

END START

              

     

      MOV AH,2

      MOV DL,BL

      INT 21H

     

      MOV AH,4CH

      INT 21H     

ENDS

END START