Question

Please show all work an explain to be upvoted.

Write an assembly program to convert an 8 character string from upper case to lower case.

Answer 1

.MODEL SMALL
        .DATA

                MSG DB 0DH,0AH, \' Enter the string :-----> : $\'
                MSG2 DB 0DH,0AH, \' Entered string is :-----> : $\'
                STR1 DB 255 DUP(?)
                ONE DB ?
                TWO DB ?
          .CODE

BEGIN:
          MOV AX,@DATA
          MOV DS,AX

          LEA DX,MSG
          MOV AH,09H
          INT 21H

          LEA SI,STR1
          MOV AH,01H

READ:
          INT 21H
          MOV BL,AL

          CMP AL,0DH
          JE DISPLAY

          XOR AL,20H
          MOV [SI],AL
          INC SI

          ;CMP BL,0DH
          JMP READ

DISPLAY:

          MOV AL,\'$\'
          MOV [SI],AL

          LEA DX,MSG2
          MOV AH,09H
          INT 21H

          LEA DX,STR1
          MOV AH,09H
          INT 21H

         ; MOV AH,4CH
         ; INT 21H
          .EXIT