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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!ogicse!news.u.washington.edu!serval!yoda.eecs.wsu.edu!bgraham
- From: bgraham@yoda.wsu.edu (Brooks Graham )
- Newsgroups: comp.os.os2.misc
- Subject: Memory support GT 16Mb
- Message-ID: <1992Aug31.233844.6624@serval.net.wsu.edu>
- Date: 31 Aug 92 23:38:44 GMT
- Article-I.D.: serval.1992Aug31.233844.6624
- Sender: news@serval.net.wsu.edu (USENET News System)
- Organization: Washington State University!
- Lines: 25
- Originator: bgraham@yoda.eecs.wsu.edu
-
- 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)
-
- thanks
-
- Brooks Graham
-
- ----------------------------|-----------------------------------------------
- Brooks Graham | "Only the meek get pinched,
- bgraham@yoda.eecs.wsu.edu | the bold survive."
- | Ferris Bueller, FBDO
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