Assembly Language Tutorial

 
 
 

Instructions

Input - Output Instructions

Display a character Read a character and display it on new line Display string Read digit, compute and display sum w/o variable Read digit, display difference w/o variable Read digit, compute, display sum using variable Read digit, display difference using variable Convert lower case letter in to upper case Read character, display in new line - user prompt Read 1st, middle, last initial - down left margin Read one hex digit, display next line in decimal Display 10*10 solid box asterisk - INT 21H and 9H Read 3 char show in middle of 11*11 box, beep comp

Flow Control Instructions

Print ASCII characters Print counting from 0 to 9 Print upper case letters from A to Z Print lower case letters from a to z in reverse Read letter print if it is \'?\' - simulation of if Read char print smallest - simulation of if-else Positive, negative num- simulation of switch-case Print upper case char - simulation of if-else then Simulation of if-else then structure Print ASCII characters - for loop simulation Print upper case A to Z - while loop simulation Print upper case A to Z - Do while loop simulation Read letters display in next line in alpha order Display digit in next line if fail prompt message Read hex digit display on next line in decimal Display capital letter in string alphabetically Show longest sequence consecutive alphabetically

Logic - Shift - Rotate Instructions

Convert upper to lower case - OR logic instruction Convert lower to upper - AND logic instruction Display even or odd number - TEST instruction Multiply content of AL by 8 - SHL instruction Divide content of AL by 4 - SHR instruction Store binary- BX,count bit value 1 w/o changing BX Read binary num, reverse its bit pattern Read binary number store in BX and display Read char- show ASCII in binary- 1 bit in ASC code Read char print ASCII in HEX till- carriage return Read HEX number and print in binary next line Read binary number and print in HEX next line Read 2 binary number and print its sum in binary Read 2 unsigned HEX num and print their sum Read string of decimal digit print sum in HEX Read str of char ter by CR show reverse order Read character using procedure goto next line Binary form & reverse bit of num - procedures Product by ADD, SHIFT instruction - procedure Display text with letters in each word reversed Validate expression READ store bin num in AX, RANDOM, WRITE

Multiplication - Division Instructions

Print factorial in binary form - MUL instruction Print num decimal form - DIV, OUTDEC proc Print factorial in decimal form - MUL, DIV instru Print num next line - proc for DECIMAL i/o Proc INDEC and OUTDEC, handle BackSpace key Proc INDEC and OUTDEC - files - INCLUDE instru Print factorial in dec form - MUL, DIV instruction Proc INDEC, OUTDEC - Handle OverFlow Read time in seconds display time HH:MM:SS Express - quarter, dime, nickel, pennie Read fraction form M/N print N decimal place GCD of two integers M and N

Arrays - Addressing Modes

Sum of array - sum in AX - Register Indirect Mode Initialize array with 0 using DUP instruction Enter an array of size 10 and display it Declare, initialize, print 2D array of size 5x5 Enter 2D array of 5x5 in row major order, print Print 3rd R x 4th C using Register Indirect Mode Display reversing array contents using STACK Reverse content of array - Register Indirect Mode Sort array using Bubble Sort method Sort an array using Select Sort method Print 2D array of size 4x5 in row major order Print 2D array of size 4x5 in column major order 2D arr clear 3rd row 4th column - Based Index Mode Compute class average on each exam Print name each student, average of 4 exams Insert single characters into array - it is sorted

String Instructions

Copy string into another using MOVSB, REP Read string, stores in variable using STOSB Display string using instruction LODSB Store display str - proc READ_STR, DISP_STR Count no of vowels constants - SCASB, REPNE

General Programs

Get and display the current system time
 

Program to display ?, read three initials, display them in the middle of an 11*11 box of asterisks, beep the computer

 
 .MODEL SMALL
 .STACK 100H

 .DATA
    PROMPT     DB  0DH,0AH,\'Enter three initials : $\'
    ASTERISKS  DB  \'***********\',0DH,0AH,\'$\'
    NEXT_LINE  DB  0DH,0AH,\"$\"

 .CODE
   MAIN PROC
     MOV AX, @DATA                ; initialize DS
     MOV DS, AX

     MOV AH, 2                    ; display \"?\"
     MOV DL, \"?\"
     INT 21H

     LEA DX, PROMPT               ; load and display the string PROMPT
     MOV AH, 9
     INT 21H

     MOV AH, 1                    ; read first initial
     INT 21H

     MOV BL, AL                   ; save first initial in BL

     INT 21H                      ; read second initial

     MOV BH, AL                   ; save second initial in BH

     INT 21H                      ; read third initial

     MOV CL, AL                   ; save third initial in CL

     LEA DX, NEXT_LINE            ; load and display the string NEXT_LINE
     MOV AH, 9
     INT 21H
     INT 21H

     LEA DX, ASTERISKS            ; load the string ASTERISKS
     MOV AH, 9                                           

     INT 21H                      ; display the string ASTERISKS 5 times
     INT 21H
     INT 21H
     INT 21H
     INT 21H

     MOV ASTERISKS+4, BL          ; place the three initials in the position
     MOV ASTERISKS+5, BH          ; of middle asterisks i.e. 4,5,6.
     MOV ASTERISKS+6, CL

     INT 21H                      ; display the modified string ASTERISKS

     MOV ASTERISKS+4, \"*\"         ; place the \"*\" back in their original 
     MOV ASTERISKS+5, \"*\"         ; position
     MOV ASTERISKS+6, \"*\"

     INT 21H                      ; print the string ASTERISKS 5 times
     INT 21H
     INT 21H
     INT 21H
     INT 21H

     MOV AH, 2                    ; Beep the computer 
     MOV DL, 7H
     INT 21H

     MOV AH, 4CH                  ; return control to DOS
     INT 21H
   MAIN ENDP
 END MAIN

    Related Post:
  1. PROGRAM TO FIND THE ADDITION OF TWO 32 BIT NUMBER
  2. Program that will read a binary number and print it on the next line in decimal form using DIV instruction and OUTDEC procedure.
  3. Program to find the total no. of even and odd nos. from an array
  4. Program to print all the ASCII characters i.e. 256
  5. PROGRAM TO CHANGE THE SIZE OF CURSOR
  6. Program to find whether the input number is prime or not
  7. Program to read one of the hex digits A-F, and display it on the next line in decimal
  8. Program that reads a character and prints it only if it is y or Y (Simulation of If-Else then structure).
  9. To find the Prime Numbers between 1 to 50
  10. PROGRAM TO COPY ONE STRING INTO ANOTHER STRING WITH AND WITHOUT USING MOVSB INSTRUCTION USING MACRO
  11. Program to display a character
  12. Program to compare two strings
  13. Program to read a character and display it on new line with user prompts initialized by constants.
  14. Program to encrypt a given string
  15. Program to read two digits whose sum is less than 0, computes and display their sum (without using variables)
  16. Program to Open an Existing file write into it and close it
  17. Program that reads a character and prints it only if it is ? ( Simulation of If structure ).
  18. To divide 10 8-bit data in an array by 20 and store the result in another array, first quotient and then remainder
  19. PROGRAM TO RESTART THE COMPUTER
  20. PROGRAM TO EXCHANGE TWO MEMORY LOCATION WITH OUT USING XCHG ; INSTRUCTION