emu8086-programs/Stack.asm at main · SusmoyDas98/emu8086-programs · GitHub

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;=========================
; STACKS
;=========================

;=========================
; -> FOLLOWS THE LIFO BEHAVIOR
; -> PUSH USED FOR APPENDING SOMETHING IN THE STACK
; -> POP USED FOR EXTRACTING SOMETHING FROM THE STACK
; -> PUSHF USED FOR APPENDING THE CURRENT FLAG CONDITION IN STACK
; -> POPF USED FOR EXTRACTING THE FLAG CONDITIONS FROM THE STACK
;=========================


.MODEL SMALL

.STACK 100H ; CAN USE  UPTO 100 USING

.DATA

; declare variables here
ARRAY DB 1,2,3,4

.CODE
MAIN PROC

; initialize DS

MOV AX,@DATA
MOV DS,AX

; enter your code here


; STACK POINTER ALWAYS USES 16 BITS

;MOV AX, 100
;PUSH AL ; WILL GIVE US ERROR
PUSH AX
PUSH AX

; ONLY CHANGES THE POINTER, DOES NOT REMOVE THE VALUE FROM THERE

POP BX ; POPS AND STORES IN THE BX REGISTER


; SHOW THE ARRAY IN REVERSE ORDER
LEA SI, ARRAY
MOV CX , 4
;MOV SI, 0
PUSH_TO_STACK:
    MOV AL, [SI]
    MOV AH, 0
    PUSH AX
    INC SI
LOOP PUSH_TO_STACK
MOV  BX, 0

APPEND_TO_ARRAY:
    CMP BX,4
    JGE EXIT
    POP DX
    MOV AL, DL
    MOV ARRAY[BX], AL
    INC BX
JMP APPEND_TO_ARRAY
EXIT:

MOV SI, 0
MOV AH, 2
MOV CX, 4
ARRAY_PRINTING:
    MOV DL, ARRAY[SI]  ; STORES THE  VALUE PRESENT  AT SI INDEX OF THE ARRAY IN DL
    ADD DL, 30H
    INT 21H
    INC SI
LOOP ARRAY_PRINTING


;exit to DOS

MOV AX,4C00H
INT 21H

MAIN ENDP
    END MAIN