From: Fleet Teachout <fleet AT cbl DOT umces DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Creating 16-bit code?
Date: Fri, 29 Jan 1999 15:05:58 -0500
Organization: University of Maryland Chesapeake Biological Laboratory
Lines: 44
Message-ID: <Pine.GSO.4.05.9901291454000.22923-100000@cbl.umces.edu>
References: <199901291338 DOT OAA09477 AT acp3bf DOT physik DOT rwth-aachen DOT de>
NNTP-Posting-Host: cbl.umces.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Trace: gamera.cbl.umces.edu 917640361 29394 199.75.0.6 (29 Jan 1999 20:06:01 GMT)
X-Complaints-To: feedback AT cbl DOT umces DOT edu
NNTP-Posting-Date: 29 Jan 1999 20:06:01 GMT
Cc: Fleet Teachout <fleet AT cbl DOT cees DOT edu>
In-Reply-To: <199901291338.OAA09477@acp3bf.physik.rwth-aachen.de>
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

On Fri, 29 Jan 1999, Hans-Bernhard Broeker wrote:

> In article <78qa8p$98o$1 AT gamera DOT cbl DOT umces DOT edu> you wrote:
> > I need to write code for a 16-bit 386 Janus barcode scanner with 450kb of 
> > useable RAM. 
> 
> This sentence contains two questionable bits of info:
> 
> 1) There is no such thing as a 16-bit 386. So either you just mixed
> your attributes a bit unfortunately (talking about a 16-bit scanner with
> a 386 CPU in it), or you lack some important knowledge :-(

Both? :)

> 2) 'code for a [...] scanner' is not too clear a description. 
>
> If you're trying to write code for embedded use, you might be in for a
> tough ride, and the choice of 32bit or 16bit compiler will not play
> any important role at all. Generally, you'll always need specialized
> compilers for use with embedded applications. Only if the embedded
> system provides an almost completely DOS compatible environment, you
> may hope to be able to use standard compilers.

The scanner contains a 386 CPU, 640K RAM (470K useable as a RAM disk).
When I attempted to run the program I developed in the scanner, I got
"load error: no DPMI". (or something real close to that).

I have since loaded and successfully run essentially the same program
written and compiled in Quick Basic 4.0.

The assumption I have made (and I'll freely admit I may be WAAAAY off) is
that I need to use code that will run in a 16-bit environment.

The question(s) is/are:  Can I generate 16-bit code using DJGPP operating
in a 32-bit environment - and if so, how?

					- fleet -

> 
> --
> Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
> Even if all the snow were burnt, ashes would remain.
>