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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!munnari.oz.au!bruce.cs.monash.edu.au!monu6!yoyo.cc.monash.edu.au!parry
- From: parry@yoyo.cc.monash.edu.au (Tom J Parry)
- Subject: Re: Memory support GT 16Mb
- Message-ID: <1992Sep2.015208.14451@monu6.cc.monash.edu.au>
- Originator: parry@yoyo.cc.monash.edu.au
- Sender: news@monu6.cc.monash.edu.au (Usenet system)
- Organization: Monash University, Melb., Australia.
- References: <1992Aug31.233844.6624@serval.net.wsu.edu>
- Date: Wed, 2 Sep 1992 01:52:08 GMT
- Lines: 28
-
- Brooks Graham (bgraham@yoda.wsu.edu) wrote:
- > Here's a question: I've seen motherboards on the market that support up
- > to 64 Mb of memory on the motherboard. It's my understanding that the magic
- > 16Mb limit is due to ISA's DMA controller being unable to address beyond
- > the 16Mb line.
- >
- > The question is this: have these manufacturers implemented a DMA controller
- > capable of going over the 16Mb line? Or is it that DOS DMA xfers _always_
- > occur below that line? For that matter, is having over 16Mb when using
- > DOS/Windoze dangerous? Hmmm. I suppose that when using a v86 box under
- > Windoze/Desqview that the DMA addresses resolve between the 0-640 range
- > through the magic of 386/486 memory mapping.
- >
- > In any event, if someone can make sense of my question and has an answer,
- > it would be appreciated. I have one of these motherboards and am
- > considering increasing the memory over 16Mb (currently running at 8)
- >
-
- I have a 24meg ISA machine and it seems that OS/2 uses the memory over 16MB
- (using the GT16MB patch) as swap space. My SWAPPER.DAT has not grown over 1
- meg since I installed the extra memory. It does mean that I get a small
- delay when closing windows where nothing happens, but I suspect this is a
- replacement of the disk activity that used to occur in the same situation.
-
-
- --
- Tom J Parry.
- Your reality is a figment of my imagination.
-