8086 Programs: DOS Interrupts

 DOS Interrupt functions can be implemented using Assembly programming.

Display System Date

Aim: 

To display the system date in DD/MM/YYYY format using Assembly language programming. 

Software Used:

MASM

Program Code:

.MODEL SMALL

.DATA

.CODE

START: MOV AX, @DATA

MOV DS, AX

DATE: MOV AH, 2AH

INT 21H

MOV AL, DL

AAM

MOV BX, AX

CALL DISP

MOV DL, '/'

MOV AH, 02H

INT 21H

MONTH: MOV AH, 2AH

  INT 21H

MOV AL, DH

AAM

MOV BX, AX

CALL DISP

MOV DL, '/'

MOV AH, 02H

INT 21H

YEAR: MOV AH, 2AH

INT 21H

MOV AL, 14H

AAM

MOV BX, AX

CALL DISP

MOV AH, 2AH

INT 21H

ADD CX, 0F830H

MOV AL, CL

AAM

MOV BX, AX

CALL DISP

MOV AH, 4CH

INT 21H

DISP PROC  

MOV DL, BH

ADD DL, 30H

MOV AH, 02H

INT 21H

MOV DL, BL

ADD DL, 30H

MOV AH, 02H

INT 21H

RET

DISP ENDP

END START

                HLT

Result: 

System date is printed on execution of the program.

---

Display System Day

Aim: 

To display the system day using Assembly language programming.  

Software Used:

MASM

Program Code:

.MODEL SMALL

.DATA

DMSG0 DB 10,13,'SUNDAY   ','$'

DMSG1 DB 10,13,'MONDAY   ','$'

DMSG2 DB 10,13,'TUESDAY  ','$'

DMSG3 DB 10,13,'WEDNESDAY','$'

DMSG4 DB 10,13,'THURSDAY ','$'

DMSG5 DB 10,13,'FRIDAY   ','$'

DMSG6 DB 10,13,'SATURDAY ','$'

.CODE

START: MOV AX, @DATA

        MOV DS, AX

        MOV AH, 2AH    ; To get System Date

        INT 21H

        CMP AL, 00H    ; Day is in AL

        JNE NXT1

        MOV DX, OFFSET DMSG0

        CALL DISP

NXT1: CMP AL, 01H    ; Day is in AL

        JNE NXT2

        MOV DX, OFFSET DMSG1

        CALL DISP

NXT2: CMP AL, 02H    ; Day is in AL

        JNE NXT3

        MOV DX, OFFSET DMSG2

        CALL DISP

NXT3: CMP AL, 03H    ; Day is in AL

        JNE NXT4

        MOV DX, OFFSET DMSG3

        CALL DISP

NXT4: CMP AL, 04H    ; Day is in AL

        JNE NXT5

        MOV DX, OFFSET DMSG4

        CALL DISP

NXT5: CMP AL, 05H    ; Day is in AL

        JNE NXT6

        MOV DX, OFFSET DMSG5

        CALL DISP

NXT6: CMP AL, 06H    ; Day is in AL

        JNE TERMI

        MOV DX, OFFSET DMSG6

        CALL DISP

; To terminate the Program

TERMI: MOV AH, 4CH    ; To Terminate the Program

        INT 21H

; Display Part

DISP PROC

        MOV AH, 09H    ; To Print in DOS

        INT 21H

        RET

DISP ENDP      ; End Display Procedure

        END START      ; End of MAIN
                HLT

Result: 

System day is printed on execution of the program.

---

Display System Time

Aim: 

To display the system time in HH/MM/SS format using Assembly language programming.  

Software Used:

MASM

Program Code:

.MODEL SMALL
.DATA
.CODE
START: MOV AX, @DATA
MOV DS, AX
HOUR: MOV AH, 2CH
INT 21H
MOV AL, CH
AAM
MOV BX, AX
CALL DISP
MOV DL, ':'
MOV AH, 02H
INT 21H
MINUTES: MOV AH, 2CH
  INT 21H
MOV AL, CL
AAM
MOV BX, AX
CALL DISP
MOV DL, ':'
MOV AH, 02H
INT 21H
SECONDS: MOV AH, 2CH
INT 21H
MOV AL, DH
AAM
MOV BX, AX
CALL DISP
MOV AH, 4CH
INT 21H
DISP PROC  ;display procedure
MOV DL, BH
ADD DL, 30H
MOV AH, 02H
INT 21H
MOV DL, BL
ADD DL, 30H
MOV AH, 02H
INT 21H
RET
DISP ENDP
END START
HLT

Result: 

System time is printed on execution of the program.