CSE 322 Spring 2021 Lab 6

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Task #1

Introduction to Stack

//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC  
    mov ax, @data
    mov ds, ax  
    
    mov ax, 1234h
    mov bx, 5678h
    push ax
    inc ax
    push ax
    push bx         
    
    pop cx
    pop dx
    pop cx
    
    pushf
    sub ax,ax
    popf

ENDP MAIN
end MAIN

Task #2

Write a code to take an input string and print the string in reverse.

//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC  
    mov ax, @data
    mov ds, ax  
    
    mov ah, 2
    mov dl, '?'
    int 21h
    mov ah, 1
    mov cx, 0

label1:
    int 21h
    cmp al, 0dh
    je label2
    push ax
    inc cx
    jmp label1    
    
label2:        
    mov ah, 2
    mov dl, 0ah
    int 21h
    mov dl, 0dh
    int 21h

label3:
    pop dx
    int 21h
    loop label3
    
    mov ah, 4ch
    int 21h    


ENDP MAIN
end MAIN

Task #3

Introduction to procedure

//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC  
    mov ax, @data
    mov ds, ax  

    mov ax, 1595
    mov bx, 2526
    call a    
    
    mov ah, 4ch
    int 21h    


ENDP MAIN 

a PROC
    add ax, bx
    ret     
endp a    

end MAIN

Task #4

Write a code with a multiply procedure.

//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC  
    mov ax, @data
    mov ds, ax  

    mov ax, 2
    mov bx, 3
    call multiply    
    
    mov ah, 4ch
    int 21h    


ENDP MAIN 

multiply PROC
    push ax
    push bx
    xor dx, dx
repeat:
    test bx, 1
    jz endif
    
    add dx, ax
endif:
    shl ax, 1
    shr bx, 1
    jnz repeat
    
    pop bx
    pop ax    
    ret     
endp multiply    

end MAIN

 

Task #5

Multiplication procedure by addition

//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC  
    mov ax, @data
    mov ds, ax  

    mov ax, 2
    mov bx, 30
    call multiply    
    
    mov ah, 4ch
    int 21h    


ENDP MAIN 

multiply PROC
    push ax
    push bx 
    push cx
    mov cx, bx
    xor dx, dx
top:
    add dx, ax
    loop top
    
    pop cx    
    pop bx
    pop ax    
    ret     
endp multiply    

end MAIN

 

Task #6

Multiply and division instruction

//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC  
    mov ax, @data
    mov ds, ax  

    mov ax, 2
    mov bx, 0FFFFh
    mul bx   
    imul bx   
    
    div bx
    idiv bx
    
    mov ah, 4ch
    int 21h    


ENDP MAIN 
end MAIN

Task #7

Write a program that prompts user to enter 2 binary numbers upto 8 digits each, and print their sum in the next line in binary. If the user enters illegal character, the user should be prompted to begin again. Each input ends withj a carriage return.

Sample execution:
Type a binary number, upto 8 digits: 11001010
Type a binary number, upto 8 digits: 10011100
The binary sum is 101100110
//Code
To be done by students

Homework

  • Chapter 7 Problem 9
  • Chapter 7 Problem 10
  • Chapter 7 Problem 11
  • Chapter 7 Problem 13
  • Chapter 7 Problem 14
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