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Friday, February 21, 2014
ASSUME CS: CODE, DS: DATA
DATA SEGMENT ; start of data
segment
MSG1 DB 0DH, 0AH,'ENTER YOUR NAME : ', '$'
MSG2 DB 'WHAT IS YOUR NAME? ',
'$'
STR DB
25 DUP(' '), '$' ; 25 bytes of STR array (blank) is declared to store
the user entered name.
X DB 04H ; X coordinate
value
Y DB 12H ; Y
coordinate value
DATA ENDS
DISPLAY MACRO MSG ; DISPLAY macro definition starts
MOV DX, OFFSET MSG
MOV AH, 09H ; display the message whose offset is in
DX using 09H
INT 21H ; with DOS 21H interrupt.
ENDM ; end of macro definition
CODE SEGMENT
START:
MOV AX, DATA ; data segment initialization
MOV DS, AX
DISPLAY MSG1 ; invoke the DISPLAY macro to display
MSG1
MOV SI, OFFSET STR ; SI
point to the 1st memory location of STR array
BACK: MOV AH, 01H ; read a character from keyboard using
01H service
INT 21H ; with 21h interrupt, then compare with
enter key
CMP AL, 0DH ; if yes terminate, otherwise store in
STR array pointed by SI JE
STOP ; if yes terminate,
MOV [SI], AL ; otherwise store in STR array pointed by
SI
INC
SI ; increment SI, to point to the next
location of STR array
JMP BACK ; jump to BACK to
read the next character
STOP: MOV
AH, 07H ; service number
to clear the screen
MOV AL, 00H
; Number of lines to scroll; 00 blank
screen.
MOV BH, 0FH ; attribute of
character; 0F white and 00 black
MOV CX, 00H ; CH=00 Y coordinate of upper left corner
and
; CL=00 X
coordinate of upper right corner.
MOV DH, 31H ; Number of rows;
MOV DL, 79H ; Number of columns;
INT 10H ; BIOS interrupt
to clear the screen is invoked
MOV
AH, 02H ; service number to set the cursor
MOV BH, 00H ; set video Page number to 0
MOV DH, Y ; store row
number in DH (Y coordinate)
MOV
DL, X ; store the
column number (X) in DL register
INT
10H ;
BIOS interrupt to set the cursor is invoked.
DISPLAY MSG2 ; invoke the
DISPLAY macro to display MSG2.
DISPLAY STR ; invoke the
DISPLAY macro to display STR array contents
MOV AH, 4CH ; terminate the program
INT 21H
CODE ENDS ; end of code segment
END
START ; end of program
Output:
D:\MASM>
Masm 7a.asm;
D:\MASM>
Link 7a.obj;
D:\MASM>
TD 7a.exe
Press
F7 to trace the program (line by
line execution).
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