The document discusses the stack segment in a program and stack instructions. It provides an example program that uses push and pop instructions to store user input in the stack and then pop and display the values. Key points: 1) The stack segment is used for temporary storage of data and addresses in a last-in, first-out manner. 2) Common stack instructions are PUSH, POP, PUSHF, and POPF which add/remove from the top of the stack without affecting flags. 3) The example program takes input, pushes to the stack, and then pops and displays the values to demonstrate stack usage.

1. HIGH 5

2. Name :
Ms. Nasrin Akter
Designation
Lecturer
Department
Department of Computer Science and Engineering
Faculty
Faculty of Science and Information Technology
E-mail
nasrin.cse@diu.edu.bd

3. Thofayel Ahmed Khan Shourov-----151-15-5192

10. The Stack
 The stack segment of a program is used for temporary storage of data
and addresses. The item are added and removed from one end of the
structure, and the processed in a “last-in, first-out”.
 Represent an example of a procedure that performs binary multiplication
by bit shifting and adding.

11. The Stack
Stack instruction are
PUSH,POP,PUSHF and POPF There
is no effect of stack instructions
on flag.

12. The stack
The preceding stack declaration, SP.
The stack pointer is initialized to 0100h.
It is empty stack.
When it is not empty, it contains the
offset address of the top of the stack.

13. Stack Instruction
PUSH source.
Source is 16 bit
register.
PUSH AL.
Sp decreased by 2.

15. .model small
.stack 100h
.data
main proc
mov ah,1
int 21h
push ax
mov ah,1
int 21h
push ax
mov ah,1
int 21h
push ax
mov ah,1
int 21h
push ax
mov ah,1
int 21h
push ax
mov ah,1
int 21h
push ax
mov ah,1
int 21h
push ax
mov ah,1
int 21h
push ax
mov ah,1
int 21h
push ax
mov ah,1
int 21h
push ax

16. pop bx
mov ah,2
mov dl,0dh
int 21h
mov dl,0ah
int 21h
mov dx,bx
int 21h
pop bx
mov ah,2
mov dx,bx
int 21h
pop bx
mov ah,2
mov dx,bx
int 21h
pop bx
mov ah,2
mov dx,bx
int 21h
pop bx
mov ah,2
mov dx,bx
int 21h
pop bx
mov ah,2
mov dx,bx
int 21h
pop bx
mov ah,2
mov dx,bx
int 21h
pop bx
mov ah,2
mov dx,bx
int 21h
pop bx
mov ah,2
mov dx,bx
int 21h
mov ah,4ch
int 21h
main endp

18. Push
 The operation to place a new item at the top of the stack

20. Pop
 The operation to remove the next item from the top of the stack