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 that prompts the user to enter a character, and on subsequent lines print its ASCII code in binary, and the number of 1 bits in its ASCII code

 
 .MODEL SMALL
 .STACK 100H

 .DATA
   PROMPT_1  DB  \'Enter the character : $\'
   PROMPT_2  DB  0DH,0AH,\'The ASCII code of the given number in binary form is : $\'
   PROMPT_3  DB  0DH,0AH,\'The number of 1 bits in ASCII code are : $\'

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

     LEA DX, PROMPT_1             ; load and display PROMPT_1   
     MOV AH, 9
     INT 21H

     MOV AH, 1                    ; read a character
     INT 21H

     XOR BX, BX                   ; clear BX
     MOV BL, AL                   ; move AL to BL

     LEA DX, PROMPT_2             ; load and display PROMPT_2
     MOV AH, 9
     INT 21H

     XOR BH, BH                   ; clear BH
     MOV CX, 8                    ; initialize loop counter
     MOV AH, 2                    ; set output function

     @OUTPUT:                     ; jump label
       SHL BL, 1                  ; shift left BX by 1 bit

       JNC @ZERO                  ; jump to label @ZERO if CF=0
       INC BH                     ; increment BH
       MOV DL, 31H                ; set DL=1
       JMP @DISPLAY               ; jump to label @DISPLAY

       @ZERO:                     ; jump label
         MOV DL, 30H              ; set DL=0

       @DISPLAY:                  ; jump label
         INT 21H                  ; display digit
     LOOP @OUTPUT                 ; jump to label @OUTPUT

     LEA DX, PROMPT_3             ; load and display the string PROMPT_3
     MOV AH, 9
     INT 21H

     OR BH, 30H                   ; convert the decimal to ascii code

     MOV AH, 2                    ; print the contents of BH
     MOV DL, BH
     INT 21H

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

    Related Post:
  1. Program to convert a string into uppercase/lowercase
  2. Program to print all the ASCII characters i.e. 256
  3. Program to check whether the number inputted is prime or not
  4. Program to check whether the input string is a valid identifier or not. (Note: string starting with digit is not valid)
  5. Program to accept a name from the user and check whether the name is present in the defined table, If not present then insert the name in the table
  6. TO CONVERT A STRING INTO UPPER CASE TO LOWERCASE
  7. PROGRAM TO CLEAR THE SCREEN AND MAKE BLUE FOREGROUND
  8. Program to copy one string into another string
  9. Program to print average of 2 numbers
  10. Program which gives +, -, /, * of 2 8 bit numbers
  11. An application for copying 16-bit reverse data from one location to other
  12. Program to perform all DIVISION on two operands : (decimal, binary, octal,hexadecimal)
  13. Program to read two digits such that second digit is less than the first digit, computes and display their difference ( without using variables ).
  14. PROGRAM TO PRINT THE DIGITS
  15. Procedure that displays a decimal number in the range -32767 to +32767
  16. Program to print Upper Case Letters from A to Z
  17. Program to enter two 16 bit binary numbers and perform OR operation on it
  18. Program to declare a byte_table and then add each byte to get the final sum(Hint: Use Indirect Addressing)
  19. AN APPLICATION WHICH DIVIDES 10 8-BIT DATA STORED IN ARRAY BY 20 AND STORE IN 2ND ARRAY QUOTIENT AND THEN REMAINDER
  20. Program that prompts the user to type a hex number of four hex digits or less, and outputs it in binary on the next line. If the user......