Subtraction of two decimal digits in 8086 Microprocessor x86 Assembly Language

This 8086 microprocessor assembly program subtracts two decimal digits and prints the output accordingly. If you want to know how can you print a single character in 8086 assembly language you can find it IN THIS LINK. If you have questions or any problems feel free to ask in the comments section.

TITLE THE_LAME_PROGRAMMER 
.MODEL SMALL 
.STACK 100H 
.DATA 
    DIGIT1 DB 0AH, 0DH, "ENTER FIRST DIGIT: $" 
    DIGIT2 DB 0AH, 0DH, "ENTER SECOND DIGIT: $" 
    RESULT DB 0AH, 0DH, "RESULT IS: $" 
  
.CODE 
 
    MAIN: 
        MOV AX, @DATA 
        MOV DS, AX 
         
        MOV DX, OFFSET DIGIT1 
        MOV AH, 09H 
        INT 21H 
         
        MOV AH, 01H 
        INT 21H 
        SUB AL, 30H 
        MOV BH, AL 
         
        MOV DX, OFFSET DIGIT2 
        MOV AH, 09H 
        INT 21H 
         
        MOV AH, 01H 
        INT 21H 
        SUB AL, 30H 
        MOV BL, AL 
         
        CMP BH, BL 
         
        JL MINUS 
         
        SUB BH, BL 
         
        MOV DX, OFFSET RESULT 
        MOV AH, 09H 
        INT 21H 
         
        MOV DL, BH 
        ADD DL, 30H 
        MOV AH, 02H 
        INT 21H 
         
        JMP EXIT 
         
   MINUS: 
        SUB BL, BH 
         
        MOV DX, OFFSET RESULT 
        MOV AH, 09H 
        INT 21H 
         
        MOV DL, '-' 
        MOV AH, 02H 
        INT 21H 
         
        MOV DL, BL 
        ADD DL, 30H 
        MOV AH, 02H 
        INT 21H 
         
   EXIT: 
        MOV AH, 04CH 
        INT 21H 
   END MAIN 

OUTPUT OF THE PROGRAM

Subtraction of two decimal digits in 8086 Microprocessor x86 Assembly Language

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 This x86 Assembly Language program takes users input in 8086 Microprocessor Assembly Language and prints the cube of it.

To run this x86 Assembly Code you need to Download emu8086 software. Copy the following 8086 microprocessor Assembly Language code and paste this code to emu8086 and hit the play button.

TITLE PUCHTAA

.MODEL SMALL

.STACK 100H

.DATA

    MSG DB 0AH, 0DH, "ENTER A NUMBER TO FIND CUBE OF IT: $"

    OUT1 DB 0AH, 0DH, "CUBE OF $"

    OUT2 DB " IS $"

    QUIT DB 0AH, 0DH, "CONTINUE? Y FOR YES ELSE FOR NO: $"

   

.CODE

   

    MAIN:

        MOV AX, @DATA

        MOV DS, AX

    AGAIN:

        LEA DX, MSG

        MOV AH, 09H

        INT 21H

       

       

        MOV AH, 01H

        INT 21H

       

        PUSH AX

       

        CMP AL, 39H

        JG AGAIN

        CMP AL, 30H

        JL AGAIN

       

        PUSH AX

        PUSH AX

       

        SUB AL, 30H

        MOV BL, AL

        MUL BL

        AAM

               

        MOV BX, AX ; BH = 06, BL, 04 ; IF ENTERED 08

       

        POP AX

       

        SUB AL, 30H

       

        MUL BL

       

        AAM

       

        MOV CL, AL ; FIRST RESULT

        MOV CH, AH ;CARRY

        POP AX

       

        SUB AL, 30H

        MOV BL, AL

        MOV AL, BH

        MUL BL

        AAM

       

        ADD AL, CH

        AAA

       

        MOV BX, AX

       

       

        LEA DX, OUT1

        MOV AH, 09H

        INT 21H

       

        POP DX

        MOV AH, 02H

        INT 21H

       

        LEA DX, OUT2

        MOV AH, 09H

        INT 21H

       

        MOV DL, BH

        ADD DL, 30H

        MOV AH, 02H

        INT 21H

       

        MOV DL, BL

        ADD DL, 30H

        MOV AH, 02H

        INT 21H

       

       

        MOV DL, CL

        ADD DL, 30H

        MOV AH, 02H

        INT 21H

       

              

        LEA DX, QUIT

        MOV AH, 09H

        INT 21H

       

        MOV AH, 01H

        INT 21H

        OR AL, 20H

        CMP AL, 'y'

        JE AGAIN

       

        MOV AH, 04CH

        INT 21H

  END MAIN

OUTPUT 

TAGS:

• assembly language
• emu8086
• assembly code
• assembly language programming
• x86 assembly
• assembly language example
• cube of number assembly language

Subtraction of two decimal digits in 8086 Microprocessor x86 Assembly Language

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This 8085/8086 microprocessor assembly language program asks users to input a number and finds out the square of a number and then prints it. This 8085/8086 microprocessor assembly language program has one more feature by which it doesn't accept any value other than decimal numbers and asks users if they want to quit the program or not 

TITLE PUCHTAA

.MODEL SMALL

.STACK 100H

.DATA

    MSG DB 0AH, 0DH, "ENTER A NUMBER TO SQUARE IT: $"

    OUT1 DB 0AH, 0DH, "SQUARE OF $"

    OUT2 DB " IS $"

    QUIT DB 0AH, 0DH, "CONTINUE? Y FOR YES ELSE FOR NO: $"

   

.CODE

   

    MAIN:

        MOV AX, @DATA

        MOV DS, AX

    AGAIN:

        LEA DX, MSG

        MOV AH, 09H

        INT 21H

               

        MOV AH, 01H

        INT 21H

       

        PUSH AX

       

        CMP AL, 39H

        JG AGAIN

        CMP AL, 30H

        JL AGAIN

       

        PUSH AX

       

        SUB AL, 30H

        MOV BL, AL

        MUL BL

        AAM

               

        MOV BX, AX

       

        LEA DX, OUT1

        MOV AH, 09H

        INT 21H

       

        POP DX

        MOV AH, 02H

        INT 21H

       

        LEA DX, OUT2

        MOV AH, 09H

        INT 21H

       

        MOV DL, BH

        ADD DL, 30H

        MOV AH, 02H

        INT 21H

       

        MOV DL, BL

        ADD DL, 30H

        MOV AH, 02H

        INT 21H

       

        LEA DX, QUIT

        MOV AH, 09H

        INT 21H

       

        MOV AH, 01H

        INT 21H

        OR AL, 20H

        CMP AL, 'y'

        JE AGAIN

       

        MOV AH, 04CH

        INT 21H

    END MAIN

Subtraction of two decimal digits in 8086 Microprocessor x86 Assembly Language

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Getting Started with Python Programming as an absolute beginner with Thonny IDE

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Subtraction of two decimal digits in 8086 Microprocessor x86 Assembly Language

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How To Print A Single Character in 8086 Assembly Language

 If you are getting started with 8086 assembly programming, you might encounter the elementary and very beginning program of your life, which is “how to print text in 8086 assembly language”. However, in most cases, the next step is to print a single character in the 8086 assembly language.

In an 8086 assembly language computer always works with registers of the microprocessor. in intel’s 8086 microprocessor, there are four basic general-purpose or data registers i.e.

Accumulator Register (AX)

Base Register (BX)

Counter Register (CX)

Data Register (DX)

Above mentioned registers are 16bit registers which means they consist of two bytes. These registers are further broken into ‘high byte’ and ‘low byte'. We can use them for any purpose we want. Look at the table below.

There are other types of registers as well, but for now, we will stick to them.

Now that we have an overview of Data registers, we can now write a simple assembly language program that prints single character output. 

First, we write our basic program template, which does nothing but is very important and will always be used in each assembly program.

TITLE SINGLE_CHARACTER_PRINTING

.MODEL SMALL

.STACK 100H

.DATA

;;THIS IS DATA SECTION

.CODE   

;THIS IS CODE SECTION

    MAIN:

        MOV AX, @DATA

        MOV DS, AX

        

        

            

        

        

        MOV AH, 04CH

        INT 21H

   END MAIN

If you don’t understand or want to understand more basics, you can follow this link for the instructions used in this program.

In the 8086 assembly language, a single character means one byte. Let’s say we want to print ‘A’ first, we need to move it to the data register, which is DX, and ‘A’ is one byte so that we will place it in the DL register. If you are confused, remember that if you want to print a single character, always move it to the ‘DL’ register.

MOV DL, ‘A’

MOV AH, 02H

INT 21H

Just add three lines in the above code, and you will see the output of the program. If you don't understand MOV AH, 02H and INT 21H, just go with it as at this point there is no need to get stuck to it. Just remember we write these three statements to display a single character. You just need to replace the ‘A’ in DL if you want to print something else.

Following is the complete code of above program

TITLE SINGLE_CHARACTER_PRINTING

.MODEL SMALL

.STACK 100H

.DATA

;;THIS IS DATA SECTION

.CODE   

;THIS IS CODE SECTION

    MAIN:

        MOV AX, @DATA

        MOV DS, AX

        

        MOV DL, 'A'

        MOV AH, 02H

        INT 21H

                        

        MOV AH, 04CH

        INT 21H

   END MAIN

You should see output of the program as 'A'

If you have any question or trouble you can always choose to click Ask for Help section mentioned above.

Subtraction of two decimal digits in 8086 Microprocessor x86 Assembly Language

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