BIOS/DOS CALLS – FILE MANIPULATION

AIM:

To open a file using DOS calls.

ALGORITHM:

1.      Initialize the data segment, file name and the message to be displayed.

2.      Set the file attribute to create a file using a DOS call.

3.      If the file is unable t o create a file display the message 

PROGRAM:

ASSUME CS: CODE, DS: DATA

DATA SEGMENT

FILENAME DB “SAMPLE.DAT”, “$”

MSG DB 0DH, 0AH, “FILE NOT CREATED”, ODH, OAH, “$”

DATA ENDS

CODE SEGMENT

START:          MOV AX, DATA

                        MOV DS, AX

                        MOV DX, OFFSET FILENAME

                        MOV CX, 00H

                        MOV AH, 3CH

                        INT 21H

                        JNC LOOP1

                        MOV AX, DATA

                        MOV DS, AX

                        MOV DX, OFFSET MSG

                        MOV AH, 09H

                        INT 21H

LOOP1           MOV AH, 4CH

                        INT 21H

CODE ENDS

END START

RESULT:

    Thus the file manipulation using DOS calls is written and executed.