CSE 322 Spring 2021 Lab 5

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Task #1

Introduction to logical instructions

//Code
mov ax, 01010101b
mov bx, 10101010b

mov cx, ax
and cx, bx ;Logical AND

mov cx, ax
or cx, bx ;Logical OR

mov cx, ax
xor cx, bx ;Logical XOR

mov cx, ax
not cx ;Logical NOT

mov cx, ax
test cx, bx ;Same as Logical AND. But doesnot change the value of destination register. ONly changes the flag

mov ax, 00001111b
and ax, 00110011b ;ANDing a bit with 0 clears the bit
or ax, 11001100b ;ORing a bit with 1 sets the bit
xor ax, 00110011b ;XORing a bit with 1 flips the bit

Task #2

Use TEST instruction to check if the register AX has a value 0 or not. If AX contains 0 print 0 otherwise do nothing.

//Code
To be done by students

Task #3

Use logical instructions to check if an input number is odd or even. If the number is odd print ‘O’ if even print ‘E’.

//Code
To be done by students

 

Task #4

Use only logical instruction to convert characters from uppercase to lowercase

//Code
top:
    mov ah, 1
    int 21h
    
    mov dl, al
    OR dl, 00100000b
    
    mov ah, 2
    int 21h
    mov dl, 0dh
    int 21h
    mov dl, 0ah
    int 21h
    
    jmp top

Task #5

Use only logical instruction to convert characters from lowercase to uppercase.

//Code
To be done by the students

Task #6

Use logical instructions to do a case flip. If the input is uppercase convert to lowescase and if input is lowercase convert to uppercase.

//Code
To be done by students

Task #7

Rotate and shift instructions

Homework

  • Section 6.5: Programming with High-Level Structures
  • Chapter 6 Exercise 8
  • Marut example 7.1-7.13
  • Marut Section 7.4: Binary and HEx input output [Total 4 codes]
  • Marut Chapter 7 Exercise 8
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