8086 Add two 4bit no.

Addition Of Two 4bit numbers

ASSUME CS:CODE,DS:DATA
DATA SEGMENT
    msg1 DB "Enter the first number : $"
    msg2 DB 0ah,0dh,"Enter the second number : $"
    msg3 DB 0ah,0dh,"Result :$"
DATA ENDS
CODE SEGMENT
START: MOV AX,data
    MOV DS,AX
    LEA DX,msg1
    MOV AH,09H
    INT 21H
    MOV AH,01H
    INT 21H
    SUB AL,30H
    MOV BL,AL
    LEA DX,msg2
    MOV AH,09H
    INT 21H
    MOV AH,01H
    INT 21H
    SUB AL,30H
    ADD AL,BL
    AAA
    ADD AL,30H
    LEA DX,msg3
    MOV AH,09H
    INT 21H
    MOV DL,AL
    MOV AH,02H
    INT 21H
    MOV AH,4CH
    INT 21H
CODE ENDS
END START

Output
C:\><filename.exe>
Enter the first number : 2
Enter the second number : 5
Result : 7



DosBox Commands

accessing directory
MOUNT C: ~/Downloads/masm
C:                          //accesing to C

masm <filename.asm>         //compiling
link <filename.obj>
<filename.exe>              //executing file

debug <filename.exe>        //incase an error occur, debug the file
-g