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- Xref: sparky comp.sys.ibm.pc.hardware:23101 comp.os.msdos.programmer:8927
- Path: sparky!uunet!decwrl!access.usask.ca!ccu.umanitoba.ca!ciit85.ciit.nrc.ca!brandonu.ca!dueck
- Newsgroups: comp.sys.ibm.pc.hardware,comp.os.msdos.programmer
- Subject: Re: More on DMA
- Message-ID: <1992Aug31.152155.2190@brandonu.ca>
- From: dueck@brandonu.ca
- Date: 31 Aug 92 15:21:54 CST
- References: <1992Aug26.162928.20891@csqx.cs.rhbnc.ac.uk>
- Organization: Brandon University, Brandon, Manitoba, Canada
- Lines: 20
-
- In article <1992Aug26.162928.20891@csqx.cs.rhbnc.ac.uk>, adrian@csqx.cs.rhbnc.ac.uk (A Johnstone) writes:
- > Well, my DMA saga continues. Several people told me after my last post that
- > vanilla MS-DOS does map virtual to physical as in real mode until you start
- > filling memory up (contrary to what I had claimed). I now have basic DMA
- > working on a 386, having fixed the timing problem that had been causing the
- > virtual DMA to fail.
- >
- > So far, so good, but I still need a `proper' mapped solution for general use,
- > especially under Windows. Several people (not least Ralf Brown)have drawn my
- > attention to the existence of the Virtual DMA specification (VDS) which sounds
- > like just what I want, but beyond the information in Ralf's interrupt listing
- > nobody seems to know much about it. Can anybody enlighten me, or point me some
- > documents?
- >
- > Adrian
- Try Microsoft's Device Development Kit (DDK), available from Microsoft
- for a merely exorbitant price.
-
- Gery Dueck
- dueck@brandonu.ca
-