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From: "Michael Sisco" <michael DOT sisco AT qtiworld DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Is DJGPP for me?
Date: Wed, 9 Jan 2002 22:30:35 -0600
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

I am working on a project that involves communicating with a custom board
through the PCI bus (using memory-mapped PCI passthrough) under DOS. I have
a working application that was written in MS VC++ 1.52 (don't cringe). The
existing app uses some assembly language routines to access linear memory
space (the on-board memory of our interface board is mapped to 0xC1000000).
I am nearing a point where I am going to have to add a LOT of computational
horsepower to this application, and I fear that my 16-bit app is not going
to be fast enough to keep up. I have no desire to write the entire app in
asm, nor do my colleagues have any desire to support it if I do. I want to
move to writing 32-bit apps that will run under DOS, and it appears from
what I've read so far that DJGPP may give me the capabilities that I'm
looking for. I'm making this explanation too long, so I'll get to the
point(s):

1. Is DPMI going to allow me to access linear memory?
2. How do I tell CWSDPMI the memory area that belongs to this card (so I can
stop GPF'ing)?
3. Do I need a device driver for my hardware? If so, what's a good source
for info on writing them? How do I communicate with the driver from my
application?

I would appreciate any direction that anyone can provide on any of these
subjects.

Michael Sisco