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Showing posts with label Microprocessor lab program. Show all posts
Showing posts with label Microprocessor lab program. Show all posts
Friday, February 21, 2014

a program to create a file (input file) and to delete an existing file.

5:14 PM | Posted by Unknown | | Edit Post


ASSUME DS: DATA, CS: CODE

DATA SEGMENT
FILEC DB 'D:\MPLAB\SEM4.TXT$', 0                  ;FILEC array is declared to create a file SEM4.txt in D
; directory under MPLAB folder.
FILED DB 'D:\MPLAB\123.TXT$', 0                     ;FILED array is declared to delete a file123.txt which is
;already created  in D directory under MPLAB folder.
MSG1 DB 0AH, 0DH, 'FILE IS CREATED', '$'
MSG2 DB 0AH, 0DH, 'FILE IS NOT CREATED', '$'
MSG3 DB 0AH, 0DH,'FILE IS DELETED', '$'
MSG4 DB 0AH, 0DH,'FILE IS NOT DELETED', '$'
MSG5 DB 0AH, 0DH,'CREATED FILE IS : ', '$'
MSG6 DB 0AH, 0DH,'DELETED FILE IS : ', '$'
DATA ENDS                                                             ; end of data segment

DISP MACRO MSG                                                                   ; DISP macro definition starts
MOV DX, OFFSET MSG                                                         ; display the message whose offset is in DX
MOV AH, 09H                                                           ; using 09H with DOS 21H interrupt. 
INT 21H
ENDM                                                                        ; end of macro definition

CODE SEGMENT
START: MOV AX, DATA                                          ; data segment initialization
       MOV DS, AX
       MOV DX, OFFSET FILEC                                         ; DX: offset address of  FILEC array containing the drive,
;directory path and filename to be created.
       MOV CX, 00                                                       ; CX is cleared indicating no attributes for the file. (read only)
       MOV AH, 3CH                                                   ; service no. to create file with DOS 21H interrupt
       INT 21H                                                              ; file is created
       JC NOTCRE                                                                             ; if carry flag is set to 1, it indicates that file is not created,
; then jump to label NOTCRE
       DISP MSG1                                                          ; otherwise invoke the macro to display MSG1 (created)
       DISP MSG5                                                          ; invoke the macro to display MSG5  (created file is)
       DISP FILEC                                                                             ;invoke the macro to display FILEC array contents.
       JMP NEXT                                                                               ; jump to label NEXT to delete the file.
NOTCRE: DISP MSG2                                                                  ; invoke the macro to display MSG2  (file is not created)
NEXT:  MOV DX, OFFSET FILED                            ;DX: offset address of  FILED array containing the drive,
; directory path and filename to be deleted.
       MOV AH, 41H                                                    ; service number to delete a file with DOS 21 H interrupt
       INT 21H                                                              ; file is deleted
       JC NOTDEL                                                        ; if carry flag is set to 1, it indicates that file is not deleted,
                                                                                    ; jump to label NOTDEL
       DISP MSG3                                                          ; invoke the macro to display MSG3  (file is deleted)
       DISP MSG6                                                          ; invoke the macro to display MSG6  (deleted file is)
       DISP FILED                                                          ;invoke the macro to display FILED array contents.  
       JMP EXIT                                                             ; jump to label EXIT and terminate.
NOTDEL:DISP MSG4                                                            ; invoke the macro to display MSG4 (file is not deleted)
EXIT: MOV AH, 4CH                                               ; terminate the program
       INT 21H
CODE ENDS                                                             ; end of code segment
       END START                                                       ; end of program



Output:
D:\MASM> Masm 12a.asm;
D:\MASM> Link 12a.obj;

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Read a pair of input co-ordinates in BCD and move the cursor to the specified location on the screen.

5:13 PM | Posted by Unknown | | Edit Post


ASSUME DS: DATA, CS: CODE

DATA SEGMENT                                       ; data segment starts
MSG1 DB 0AH, 0DH, "ENTER ROW NO : ","$"
MSG2 DB 0AH, 0DH, "ENTER COLUMN NO.: ","$"
ROW  DB  ?                                                   ; variable is declared to store the row value
COL   DB  ?                                                   ; to store the column value
DATA ENDS

DISPLAY MACRO MSG                                       ; Display macro definition
MOV DX, OFFSET MSG
MOV AH, 09H                                               ; display the message using 09H with 21h DOS interrupt
INT 21H
ENDM                                                            ; end of macro definition

CODE SEGMENT
START :
       MOV AX, DATA
       MOV DS, AX                                         ; data segment initialization
       DISPLAY MSG1                                      ; invoke the macro to display MSG1
       CALL   READ                                        ; call read procedure to read 2 digit BCD number (Row no.)
       MOV ROW, AL                                      ; store the 2 digit row number in ROW variable
       DISPLAY MSG2                                      ; invoke the macro to display MSG2
       CALL   READ                                        ; call read procedure to read 2 digit BCD number (column no.)
       MOV COL, AL                                       ; store the 2 digit column number in COL variable
     
       MOV AH, 07H                                       ; BIOS 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, 35H                                        ; Number of rows; Lower right row
       MOV DL, 79H                                        ; Number of rows; Lower right row
       INT 10H                                                  ; BIOS interrupt to clear the screen is invoked
       MOV AH, 02H                                       ;BIOS service number to set the cursor
       MOV BH, 00H                                        ; set video Page number to 0
       MOV DH, ROW                                       ; store row number in DH (Y coordinate)
       MOV DL, COL                                         ; store the column number (X)  in DL register
       INT 10H                                                  ; BIOS interrupt to set the cursor is invoked
      
       CALL   DELAY                                     ; call delay procedure to set the cursor at specified location.
       MOV AH, 4CH                                       ; terminate the program
       INT 21H
       READ PROC NEAR                            ; start of READ procedure
       MOV AH, 01H                                        ; read a character from keyboard using 01H service no with
       INT 21H                                                  ; DOS 21H interrupt. 
       SUB AL, 30H                                          ; subtract 30H from AL (ASCII code of user entered 1st character)
       MOV BL, 10                                  ; store the decimal number 10 in BL
       MUL BL                                                  ; multiply BL content with AL and the result is stored in AL
       MOV BL, AL                                          ; copy the result in AL to BL.
       MOV AH, 01H
       INT 21H                                                  ; read the next character from keyboard using 01H with DOS 21H
       SUB AL, 30H                                          ; subtract 30H from AL (ASCII code of user entered 2nd character)          
       ADD AL, BL                                          ; add AL and BL content to get the actual 2 digit number in AL.
       RET                                                         ; return to calling program
       READ   ENDP                                       ; end of procedure

DELAY PROC NEAR                                ; DELAY procedure starts
MOV DX, 0FFFFH
B2: MOV CX, 0FFFFH                                 ; outer and inner loop counter values stored in DX and CX
B1: LOOP B1
DEC DX
JNZ B2
RET
DELAY ENDP                                             ; end of delay procedure.
CODE ENDS                                                 ; end of code segment
       END START                                             ; end of program

     
Output:
D:\MASM> Masm 11a.asm;
D:\MASM> Link 11a.obj;
D:\MASM> 11a.exe
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