From:	"John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: help...
Date:	Thu, 05 Dec 1996 19:33:47 -0800
Organization:	Three pounds of chaos and a pinch of salt
Lines:	48
Message-ID:	<32A7941B.55B3@cs.com>
References:	<32A6CC29 DOT 2773 AT netasia DOT net>
Reply-To:	fighteer AT cs DOT com
NNTP-Posting-Host:	ppp211.cs.com
Mime-Version:	1.0
To:	"Michael O. C. Tan" <octan AT netasia DOT net>
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Michael O. C. Tan wrote:
> 
> The problem came when we translated 16bit code to 32 bit... the network
> cards we used was 3COM 3C509 and the packet driver was from CRYNWR.
> because of the memory addressing scheme of 32 bit protected mode, there
> always appear to have a "hang" or discontinuance of the packet driver
> send or receive. The group is now planning to shift to either DJGPP,
> or Borland C++ (16 or 32 bit mode). But before we make a decision, i
> would like to know that is there a way of transforming the crynwr 16 bit
> pkt driver into 32 bit mode? next would be, what files do i download in
> order to run DJGPP and from what site is it complete?

The primary distribution site for DJGPP is
<ftp://ftp.simtel.net/pub/simtelnet/gnu/djgpp/>.  Get the file
v2/readme.1st first so you know what you need to download and how to
configure DJGPP for your system.  If you need a closer ftp site
(simtel.net is in the US), go to <http://www.delorie.com/djgpp/v2faq/>
and look at the list of SimTel mirrors in the Distribution Sites
section.

Graphics programming in general is far more powerful under DJGPP than
Watcom or any other commercial DOS compiler.  However, because DJGPP
uses protected-mode instead of real mode, you will need to learn a whole
new way of accessing hardware.  The DJGPP Frequently Asked Questions
list (v2/faq202b.zip) has an extensive section on the various pitfalls
of translating 16-bit code to 32-bit; look specifically in chapters 10,
17, and 18 for most of the answers.

For extensive tutorials on graphics programming under DJGPP, visit the
DJGPP Book Project at <http://www2.ari.net/flyboy/index.html> and follow
the links.

These resources should give sufficient tips to allow you to translate
your packet driver's source code to be 32-bit compatible, but you may
need to contact its developers or write new software from scratch. 
AFAIK there is no way to directly translate real mode programs into
DPMI, especially ones that access hardware and/or use interrupts.

For any further questions, feel free to ask here on the newsgroup.  :)

Good luck!

-- 
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| John M. Aldrich, aka Fighteer I  |        fighteer AT cs DOT com         |
| Plan:  To find ANYONE willing to |   http://www.cs.com/fighteer   |
| play Descent 2 on DWANGO!        | Tagline: <this space for rent> |
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