From:	"Sahaja" <stalla AT dvsystems DOT com>
Subject:	DPMI or Dos Extender?
Newsgroups:	comp.os.msdos.djgpp
Message-ID:	<01bd381b$1493e0b0$502d07c0@vindhya>
Lines:	32
Date:	Fri, 13 Feb 1998 00:43:32 GMT
NNTP-Posting-Host:	dvs2.wli.net
NNTP-Posting-Date:	Thu, 12 Feb 1998 16:43:32 PST
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hello everybody!

I am trying to develop an applicatin to support our multi channel mpeg
decoder hardware consisting of four PCI cards
and each of which requires 8MB of Memory window( which means this hardware
occupiesphysical memory 
equal to 32MBytes), and there are FIFOs located in this range and we are
planning to use the DMA to 
transfer data from the computer memory to these FIFOs; 

My question is, can i develop such an application just using DPMI services
or must I use dos extender?  I don't care where my application resides (
either in regular dos 640k limit or in the extended memory) as long as i am
able to access our device (as mentioned above our hardware gets mapped 
32MBytes of physical memory space)!

Is there any additional convenience i get by using the dos extender except
that it permits our application to stay in extended memory (which is not
very important to me, as i am not expecting my code be more than
640kbytes)?

I have read some literature on various kinds protected modes but didn't do
such programming before, and I appreciate as much information as possible
on this subject like code samples,any good books or other kind of
documentation!

Thanks in advance.
-sahaja

  I hope this helps...

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