Run your first assembly program in DOSBox

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From the previous post we have learned to install DOSBox and to configure it so that we can run the programs written in Assembly Language. Now we have to write the hello world program and need to run that program using DOSBox.

 Step 01  Open notepad or any other text editor

First of all we need to open Notepad or any other text editor. To open notepad press Windows Key+R and then type Notepad into the command box, finally press the Enter Key.

 Step 02  Type the program given below

Now type the codes given below...

.MODEL SMALL
.STACK 100H
.DATA
MSG DB 'Hello World!$'

.CODE
MAIN PROC

MOV AX,@DATA
MOV DS,AX

LEA DX,MSG
MOV AH,9
INT 21H

MOV AH,4CH
INT 21H

MAIN ENDP
END MAIN

 Step 03  Click on Save As...

Now we need to save the text document with .asm extension. That's why we need to click on File from the menu, then we need to click on Save As... as shown in the image below.

 Step 04  Save the file with .asm extension into the folder 8086

After clicking on Save As... , a pop-up window will open as the image given below. Now we have to provide our expected name with .asm extension and most importantly we have to save the .asm file into the directory Local Disk(C:)>8086.

 Step 05  Run the DOSBox and mount the C Drive

Now we need to run DOSBox to execute our hello world program. After running the program we will get a window like the image below. Then we need to type mount c c:/8086 and need to press the Enter Key.

After pressing the Enter Key there will appear a message Drive C is mounted as local directory c:/8086\.

 Step 06  Type c: and press the Enter Key

In this step we have to type c: and need to press the Enter Key again.

 Step 07  Run the hello world program

Now type masm hello.asm and press the Enter Key several times till appearing c:\>. Then type link hello and again press the Enter Key several times till appearing c:\>. Finally type the file name hello and press the Enter Key, then the Hello World! message will appear on the screen.

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