Assembly-Language/Lab#07_Task#1.asm at main · Farhanulhaq19/Assembly-Language · GitHub

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.MODEL SMALL
.STACK 100H
.DATA
    STRING DB 'This is an String', 0
    REVERSED DB 100 DUP('$')
.CODE
MAIN PROC
    MOV AX, @DATA
    MOV DS, AX
    MOV ES, AX

    LEA SI, STRING
    LEA DI, REVERSED
    MOV CX, 0

PUSH_LOOP:
    LODSB
    CMP AL, '$'
    JE REVERSE_LOOP
    PUSH AX
    INC CX
    JMP PUSH_LOOP

REVERSE_LOOP:

    CMP CX, 0
    JE DISPLAY_STRINGS
    POP AX
    MOV [DI], AL
    INC DI
    DEC CX
    JMP REVERSE_LOOP

DISPLAY_STRINGS:

    LEA DX, STRING
    MOV AH, 09H
    INT 21H

    LEA DX, REVERSED
    MOV AH, 09H
    INT 21H

    MOV AH, 4CH
    INT 21H
MAIN ENDP
END MAIN