;----------------------------------------------------------------------
; Task  :Introduction to Assembly Programming
; Date  :29 Aug 2000
; By    :S. L. Phung ID: #######
; File  :Ex.asm  
; To compile 
;         TASM Ex.asm;
;         TLINK /t Ex
; To run is simply
;         Ex
;----------------------------------------------------------------------
.MODEL SMALL
CommonSeg    SEGMENT
             ASSUME CS:CommonSeg,DS:CommonSeg
             ORG  100h

Entry:       jmp  Start
;----------------------------------------------------------------------
;Data Area:
;---------
;YOUR DATA GO HERE
Message DB    "Hello World!", 0Dh, 0Ah, '$' ; Message to be displayed
Count   EQU   $-Message                     ; Message length
;----------------------------------------------------------------------
;Code Area:
;----------
Start:
       mov   AX, CS            ; Initialise segment registers
       mov   DS, AX            ; DS, SS points to the common segment
       mov   SS, AX            ;  

;----------------------------------------------------------------------
;YOUR CODE GOES HERE
       mov   DX, OFFSET Message; Pass parameter to subroutine 
       call  DisplayMsg        ; Display the message      
       mov   AH, 0             ; Wait for a key press 
       int   16h               ; using interrupt 16h function 0
;----------------------------------------------------------------------

ExitToDos:                     ; Exit program
       mov   AH,4Ch            ; Function 4Ch
       mov   AL,0              ; Return code 0
       int   21h               ; Interrupt 21h
;----------------------------------------------------------------------
;Subroutines used:
;-----------------
;YOUR SUBROUTINES GO HERE
DisplayMsg   PROC  NEAR
;Procedure to display an $-terminated string
;Input:
;  DX: points to the start of the string
       mov   AH, 9h            ; Display using function 9h  
       int   21h               ; Interrupt 21h 
       ret                     ; End of subroutine
DisplayMsg   ENDP

;----------------------------------------------------------------------
CommonSeg    ENDS
             END   Entry