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- Newsgroups: comp.lang.c
- Path: sparky!uunet!destroyer!gatech!usenet.ins.cwru.edu!cleveland.Freenet.Edu!au141
- From: au141@cleveland.Freenet.Edu (Amber M. Spillers)
- Subject: Re: Borland 3.1 ext. mem. capabilities?
- Message-ID: <1992Jul23.004109.7092@usenet.ins.cwru.edu>
- Sender: news@usenet.ins.cwru.edu
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- Reply-To: au141@cleveland.Freenet.Edu (Amber M. Spillers)
- Organization: Case Western Reserve University, Cleveland, OH (USA)
- References: <1992Jul21.174042.13890@vax5.cit.cornell.edu>
- Date: Thu, 23 Jul 92 00:41:09 GMT
- Lines: 45
-
-
- In a previous article, rdw@vax5.cit.cornell.edu () says:
-
- >Dear fellow MS-DOS C programmers:
- >
- > I am a Microsoft C 6.0 user thinking of switching to Borland C++ 3.1. My
- >main concern is accessing about 7 megs of extended memory past the 640K limit
- >imposed by DOS. I am already using large linked lists rather than
- >multidimensional arrays to conserve memory, but I still need more. Does anyone
- >know about Borland's Extended Memory Interface or its VROOM features? For
- >example, will it let me access this much memory? Is there a counterpart in
-
- I do belive vroom only applies to program overlays which would not
- help you with you large amount of data *too* much.
-
- >Borland C++ to Microsoft's _huge pointers? Can I mix memory models with
- >Borland (i.e. _huge pointers with a large memory model compilation)? Any other
- >thoughts on or reactions to Borland's product would be much appreciated.
-
- yes you can mix pointers ane memory models.
-
- >
- what is looks like you will need is a dos extender if you are sure
- you want to address that much memory. unfortunately theyre are many
- drawbacks to them. the first is expense, most cost a few hundred just
- to start off with and often you need to pay for a licence of each
- running copy(of your compiled program)! they also have a tendency to
- cause system compatibility problems, at least they did nefore the DMPI
- rules came out. maybe things have changed but I am willing to bet there
- is still a lot of NON-DPMI stuff out there.
- I have a hard time "suggesting" one concidering these drawbacks. are
- you sure it would not be easier to swap some stuff to disk occasionally?
- or possibly use some form of compression in memory? or even possibly
- escape dos and run it under unix or VMS?
- as you can see I am not all for dos extenders, and yes I do use one.
- but for use there really as no other way (we had to address memory above
- 1 GB because of a multibus II crate).
-
-
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