CONVERSION FROM LOWER TO UPPERCASE IN 8086 PROGRAMMING

TITLE LOWER TO UPPERCASE
.MODEL SMALL
.STACK 64
.DATA
MAXCHR DB 20
ACTCHR DB ?
ACTSTR DB 20 DUP(?)
RESULT DB 20 DUP(?)
.CODE
MAIN PROC FAR
MOV AX,@DATA
MOV DS,AX

MOV DX,OFFSET MAXCHR
MOV AH,0AH
INT 21H

LEA SI,ACTSTR
LEA DI,RESULT
MOV CX,0000H
MOV BX,0000H
LEA BX,ACTCHR
MOV CX,[BX]

L2:
MOV AL,[SI]
CMP AL,61H
JB L1
CMP AL,7AH
JA L1
SUB AL,20H
L1:
MOV [DI],AL
INC SI
INC DI
LOOP L2

MOV DL,0AH
MOV AH,02H
INT 21H

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

MOV AX,4C00H
INT 21H
MAIN ENDP
END MAIN

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CONVERSION FROM UPPER TO LOWERCASE IN 8086 PROGRAMMING

TITLE UPPER TO LOWER CASE
.MODEL SMALL
.STACK 64
.DATA
MAXCHR DB 20
ACTCHR DB ?
ACTSTR DB 20 DUP(?)
RESULT DB 20 DUP('$')
.CODE
MAIN PROC FAR
MOV AX,@DATA
MOV DS,AX

MOV DX,OFFSET MAXCHR
MOV AH,0AH
INT 21H

LEA SI,ACTSTR
LEA DI,RESULT
MOV CX,0000H
MOV BX,0000H
LEA BX,ACTCHR
MOV CX,[BX]

L2:
MOV AL,[SI]
CMP AL,41H
JB L1
CMP AL,5AH
JA L1
ADD AL,20H
L1:
MOV [DI],AL
INC SI
INC DI
LOOP L2

MOV DL,0AH
MOV AH,02H
INT 21H

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

MOV AX,4C00H
INT 21H
MAIN ENDP
END MAIN

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8086 Programming

How to display a string terminated by $?

TITLE DISPLAY A STRING
.MODEL SMALL
.STACK 32
.DATA
STR1 DB ".....THE KING OF JUNGLE......$"
.CODE
MAIN PROC FAR
MOV AX, @DATA
MOV DS,AX

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

MOV AX,4C00H
INT 21H
MAIN ENDP
END MAIN

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8086 programming

How to display a string using character reading function?

TITLE DISPLAY STRING USING CHARACTER READING FUNCTION
.MODEL SMALL
.STACK 32
.DATA
STR1 DB "....THE KING OF JUNGLE...."
LEN DW $-STR1
.CODE
MAIN PROC FAR
MOV AX,@DATA
MOV DS,AX

MOV CX,LEN
MOV AH,02
MOV BX,OFFSET STR1
L1: MOV DL,[BX]
INC BX
INT 21H
LOOP L1

MOV AX,4C00H
INT 21H
MAIN ENDP
END MAIN

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8086 Programming

How to add numbers stored in consecutive memory?

TITLE ADD THE DATA OF TABLE
.MODEL SMALL
.STACK 32
.DATA

TABLE DW 1234H,4563H,7944H,1234H
SUM DW ?
.CODE
MAIN PROC FAR
MOV AX,@DATA
MOV DS,AX

MOV CX,04H
MOV SI,OFFSET TABLE
MOV AX,0000H
L1:ADD AX,[SI]
INC SI
INC SI
DEC CX
JNZ L1


MOV AX,4C00H
INT 21H
MAIN ENDP
END MAIN

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8086 Programming

How to get string and display the string in a new line?

TITLE READ AND WRITE STRING
.MODEL SMALL
.STACK 32
.DATA
MAXCHR DB 20H
ACTCHR DB ?
STR1 DB 20 DUP('$')
.CODE
MAIN PROC FAR
MOV AX,@DATA
MOV DS,AX

MOV AH,0AH
MOV DX,OFFSET MAXCHR
INT 21H

MOV AH,02H
MOV DL,0DH
INT 21H
MOV DL,0AH
INT 21H

MOV CL,ACTCHR
MOV CH,00H
MOV BX,OFFSET STR1
L1: MOV DL,[BX]
INC BX
INT 21H
LOOP L1

MOV AX,4C00H
INT 21H
END MAIN

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8086 Programming

How to get sentence as input and display each word in new line?

TITLE MULTILINE
.MODEL SMALL
.STACK 32
.DATA
MAXCHR DB 50H
ACTCHR DB ?
STR1 DB 50 DUP(?)
.CODE
MAIN PROC FAR
MOV AX,@DATA
MOV DS,AX

MOV AH,0AH
MOV DX,OFFSET MAXCHR
INT 21H

MOV AH,02H
MOV DL,0DH
INT 21H
MOV DL,0AH
INT 21H

MOV CL,ACTCHR
MOV CH,00H
MOV BX,OFFSET STR1
 
L1:CMP BYTE PTR [BX],20H
JNZ L2
MOV DL,0DH
INT 21H
MOV DL,0AH
INT 21H
INC BX
L2:MOV DL,[BX]
INT 21H
INC BX
LOOP L1

MOV AX,4C00H
INT 21H
MAIN ENDP

END MAIN

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8086 Programming

How to add two numbers?

TITLE ADD
.MODEL SMALL
.STACK 32
.DATA
VAL1 DW 1234H
VAL2 DW 4321H
SUM DW ?
.CODE
MAIN PROC FAR
MOV AX,@DATA
MOV DS,AX

MOV AX,VAL1
ADD AX,VAL2
MOV SUM,AX

MOV AX,4C00H
INT 21H
MAIN ENDP
END MAIN

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