X-Authentication-Warning:	delorie.com: mail set sender to djgpp-bounces using -f
From:	"Rod Pemberton" <dont_use_email AT xnohavenotit DOT cnm>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Using DJGPP for C++ DOS development today?
Date:	Thu, 28 Nov 2013 06:56:04 -0500
Organization:	Aioe.org NNTP Server
Lines:	37
Message-ID:	<op.w69crqul5zc71u@localhost>
References:	<0404a92b-e194-4e75-97b5-58c8e5b3c076 AT googlegroups DOT com>
	<52957941 DOT 9050203 AT iki DOT fi>
	<57ae09cc-bc48-4dcf-978d-9078096b2127 AT googlegroups DOT com>
	<bfnhrrF6qghU1 AT mid DOT dfncis DOT de>
	<82676ab0-7e81-4b89-bc7a-e3360d6c3b93 AT googlegroups DOT com>
NNTP-Posting-Host:	CNsg4fVcCsvs3UaOgZtQCw.user.speranza.aioe.org
Mime-Version:	1.0
X-Complaints-To:	abuse AT aioe DOT org
User-Agent:	Opera Mail/12.16 (Linux)
X-Notice:	Filtered by postfilter v. 0.8.2
Bytes:	2274
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

On Thu, 28 Nov 2013 04:34:05 -0500, John Davidson <codewhakker AT gmail DOT com>  
wrote:
> Rod Pemberton wrote:

>> An alternate solution might be instruction emulation.
>
> Thanks, didn't think about that! It sounds like a fragile solution  
> though; wouldn't there be problems with switching in and out of  
> protected mode? (man, I never thought I'd ever say that again!)
>
> Surely something as basic as the xadd or cmpxchg instruction must be  
> used by every other function if it was enabled during compilation, so  
> opcode emulation would be a big performance hit?
>
> Or do I just write the 486 emulation myself in DJGPP? I can't remember  
> all this DOS interrupt business. I guess I'll have some catching up to  
> do. And stocking up, on aspirin...

I would assume the answer to all three questions is: "likely" ...  :-)

You could also search and ask on Vogons and "DOS Ain't Dead" forums:

DOS Ain't Dead
http://www.bttr-software.de/forum/forum.php

Vogons
http://www.vogons.org/

Otherwise, if emulation becomes the primary option, I may have
to post links to all the old DOS websites so you can comb
through them...

Why are you using a 386 anyway?  Or, can you upgrade slightly?
Seriously, spending money is the easiest solution.


Rod Pemberton

- Raw text -