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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
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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