Xref:	news2.mv.net comp.os.msdos.djgpp:7654
From:	John Joseph Newbigin <079519 AT bud DOT cc DOT swin DOT edu DOT au>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: assembly
Date:	Tue, 20 Aug 1996 14:07:10 +1000
Organization:	Swinburne University of Technology
Lines:	44
Message-ID:	<Pine.OSF.3.91.960820140336.2062A-100000@bud.cc.swin.edu.au>
References:	<32177794 DOT 5CA AT unm DOT edu>
NNTP-Posting-Host:	bude.cc.swin.edu.au
Mime-Version:	1.0
In-Reply-To:	<32177794.5CA@unm.edu>
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

On Sun, 18 Aug 1996 strider7 AT unm DOT edu wrote:

> im trying to learn assembly (at&t syntax), and i made a little program that 
> prints out a string:
> 
> ..file "junk.s"                          # new logical file
> 
> ..data
> 
>    string:
>       .ascii "hello there!\r\n$"
> 
> ..text
> 
> ..global _main
> _main:
> 
>       movl $string, %dx                 # move string into dx
>       movb $0x09, %ah                   # print the string, calling
>       int  $0x21                        # int 21h, subfunction 9h
This is doing a protected mode int. but DOS is a real mode program. I am 
sure there is a reason why it works under 95, but I don't know it.

What yo have to do is call a real mode interrupt by calling the DPMI 
server.  It is probably easier to use DJGPP and do inline assembly :)

Newbs.

 > 
>       ret                               # leave program
> 
> it works under win95, but doesnt under dos (with cwsdpmi v2), it prints out 
> junk on the screen.  am i doing this right, if im not, how come it works 
> under win95?
> 
> another question, what does '.align' do and why do i need it?
I'll leave this for someone else
> 
> -- 
>    http://www.unm.edu/~strider7
>    <strider7 AT unm DOT edu>
> 

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