hello.asm

开放源码的编译器open watcom 1.6.0版的源代码

;
; Copyright (C) 1996-2002 Supernar Systems, Ltd. All rights reserved.
;
; Redistribution  and  use  in source and  binary  forms, with or without
; modification,  are permitted provided that the following conditions are
; met:
;
; 1.  Redistributions  of  source code  must  retain  the above copyright
; notice, this list of conditions and the following disclaimer.
;
; 2.  Redistributions  in binary form  must reproduce the above copyright
; notice,  this  list of conditions and  the  following disclaimer in the
; documentation and/or other materials provided with the distribution.
;
; 3. The end-user documentation included with the redistribution, if any,
; must include the following acknowledgment:
;
; "This product uses DOS/32 Advanced DOS Extender technology."
;
; Alternately,  this acknowledgment may appear in the software itself, if
; and wherever such third-party acknowledgments normally appear.
;
; 4.  Products derived from this software  may not be called "DOS/32A" or
; "DOS/32 Advanced".
;
; THIS  SOFTWARE AND DOCUMENTATION IS PROVIDED  "AS IS" AND ANY EXPRESSED
; OR  IMPLIED  WARRANTIES,  INCLUDING, BUT  NOT  LIMITED  TO, THE IMPLIED
; WARRANTIES  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
; DISCLAIMED.  IN  NO  EVENT SHALL THE  AUTHORS  OR  COPYRIGHT HOLDERS BE
; LIABLE  FOR  ANY DIRECT, INDIRECT,  INCIDENTAL,  SPECIAL, EXEMPLARY, OR
; CONSEQUENTIAL  DAMAGES  (INCLUDING, BUT NOT  LIMITED TO, PROCUREMENT OF
; SUBSTITUTE  GOODS  OR  SERVICES;  LOSS OF  USE,  DATA,  OR  PROFITS; OR
; BUSINESS  INTERRUPTION) HOWEVER CAUSED AND  ON ANY THEORY OF LIABILITY,
; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
; OTHERWISE)  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
; ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;
;

;*****************************************************************************
;
; HELLO.ASM
; This program will use DOS API to write a message on the screen. Enjoy!
;
;*****************************************************************************

	.386p
	.MODEL flat

DGROUP	group _DATA,STACK		; Tasm will complain about STACK here

.CODE
;=============================================================================
start:
	mov	ah,09h			; AH = DOS API function 09h
	mov	edx,offset _msg1	; EDX = offset of string
	int	21h			; call DOS API

	mov	ax,4C00h		; return to DOS with error code 00h
	int	21h


.DATA
;=============================================================================
_msg1	db 0Dh,0Ah,'Hello world from protected mode!!!',0Dh,0Ah,'$'



.STACK
;=============================================================================
	db	1000h dup(?)


end	start