Task #1
General structure of Assembly code and printing characters.
//Solution
.MODEL small
.STACK 100H
.DATA
.CODE
MAIN PROC
MOV AH, 2
MOV DL, 41h
INT 21h
;For a New line we need to execute the following line
MOV AH, 2
MOV DL, 0dh
INT 21h
MOV DL, 0Ah
INT 21h
;New line ends
MOV DL, 62h
INT 21h
MOV DL, 63h
INT 21h
MOV DL, 'P'
INT 21h
MOV AH, 4Ch
INT 21h
ENDP MAIN
END MAIN
Task #2
Input and output of characters
//Solution
.MODEL small
.STACK 100H
.DATA
.CODE
MAIN PROC
MOV AH, 1
INT 21h ;The equivalent ascii is stored in AL
MOV BL, AL ; Data is moved to BL
;Newline
MOV AH, 2
MOV DL, 0Dh
int 21h
MOV DL, 0Ah
int 21h
MOV DL, BL ;Data moved to DL for output
int 21h
;Exit
MOV AH, 4Ch
int 21h
ENDP MAIN
END MAIN
Task #3
Printing a string the hard way
//Solution
.MODEL small
.STACK 100H
.DATA
.CODE
MAIN PROC
MOV AH, 2
MOV DL, 'H'
int 21h
MOV DL, 'E'
int 21h
MOV DL, 'L'
int 21h
MOV DL, 'L'
int 21h
MOV DL, 'O'
int 21h
MOV DL, ' '
int 21h
MOV DL, 'W'
int 21h
MOV DL, 'O'
int 21h
MOV DL, 'R'
int 21h
MOV DL, 'L'
int 21h
MOV DL, 'D'
int 21h
;Exit
MOV AH, 4Ch
int 21h
ENDP MAIN
END MAIN
Task #4
Printing a string the easy way
//Solution
.MODEL small
.STACK 100H
.DATA
str db 'Hello World!',0Dh, 0Ah,'$'
.CODE
MAIN PROC
MOV AX, @DATA
MOV DS, AX
MOV AH, 9
LEA DX, str
int 21h
MOV AH, 2
MOV DL, '.'
int 21h
;Exit
MOV AH, 4Ch
int 21h
ENDP MAIN
END MAIN
Task #5
Uppercase to lower case
//Solution
.MODEL small
.STACK 100H
.DATA
msg DB 'Enter in uppercase: $'
msg2 DB 'In lowercase: $'
crlf DB 0Dh, 0Ah, '$'
.CODE
MAIN PROC
MOV AX, @DATA
MOV DS, AX
MOV AH, 9
LEA DX, msg
int 21h
MOV AH, 1
int 21h
MOV BL, AL
MOV Ah, 9
LEA DX, crlf
int 21h
LEA DX, msg2
int 21h
ADD BL, 20h
MOV AH, 2
MOV DL, BL
int 21h
;Exit
MOV AH, 4Ch
int 21h
ENDP MAIN
END MAIN
Task #6
Lowercase to uppercase
//Solution
.MODEL small
.STACK 100H
.DATA
msg DB 'Enter in lowercase: $'
msg2 DB 'In uppercase: $'
crlf DB 0Dh, 0Ah, '$'
.CODE
MAIN PROC
MOV AX, @DATA
MOV DS, AX
MOV AH, 9
LEA DX, msg
int 21h
MOV AH, 1
int 21h
MOV BL, AL
MOV Ah, 9
LEA DX, crlf
int 21h
LEA DX, msg2
int 21h
SUB BL, 20h
MOV AH, 2
MOV DL, BL
int 21h
;Exit
MOV AH, 4Ch
int 21h
ENDP MAIN
END MAIN
Task #7
Take 2 input numbers from 0-4 and print the sum of the numbers in new line
//Solution To be done by students