Re: DMA in VM

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#2622

From: Edwin Hoogerbeets
Date: Fri, 08 Dec 1989 23:27

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In article <8800@cbmvax.UUCP> valentin@cbmvax.UUCP (Valentin Pepelea) writes:
>The 68851 MMU resides between the main processor and memory. If a DMA device
>wanted to access the memory through the MMU, it would have to be sitting on the
>same side as the processor. Obviously impossible.

Which side of the MMU are the custom chips? 

If they are on the same side as the processor, does this mean it will
obviate the distinction between chip and fast RAM, since the Meg or so
that these chips could access could be remapped to be anything? That
would be neat.

Edwin

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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!watserv1!watmath!iuvax!mailrus!uunet!microsoft!w-edwinh

References: <14059@grebyn.com> <838@tardis.Tymnet.COM> <14068@grebyn.com> <8800@cbmvax.UUCP>

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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!watserv1!watmath!iuvax!mailrus!uunet!microsoft!w-edwinh
From: w-edwinh@microsoft.UUCP (Edwin Hoogerbeets)
Newsgroups: comp.sys.amiga.tech
Subject: Re: DMA in VM
Message-ID: <9383@microsoft.UUCP>
Date: 8 Dec 89 23:27:49 GMT
References: <14059@grebyn.com> <838@tardis.Tymnet.COM> <14068@grebyn.com> <8800@cbmvax.UUCP>
Reply-To: w-edwinh@microsoft.UUCP (Edwin Hoogerbeets)
Organization: Microsoft Corp., Redmond WA
Lines: 13

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