Article View: comp.arch
Article #12993Re: Using a DMA chip in strange ways
From: grr
Date: Wed, 18 Feb 1987 07:14
Date: Wed, 18 Feb 1987 07:14
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1368 bytes
In article <4343@columbia.UUCP> dupuy@amsterdam.columbia.edu (Alexander Dupuy) writes:
>
> Since the DMA chip on your favorite disk/tape controller works by stealing
>bus cycles when the CPU is busy with other things (like arithmetic), would
>there be any advantage in having a DMA chip which would simply be used for
>memory to memory copies (from user to kernel space, or from one user space to
>another)?
Many general purpose DMA controller chips can already do this sort of thing.
Other, fancier things like BLIT chips can also to high-speed memory to memory
DMA as a degenerate case.
--
George Robbins - now working for, uucp: {ihnp4|seismo|rutgers}!cbmvax!grr
but no way officially representing arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department fone: 215-431-9255 (only by moonlite)
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!rutgers!cbmvax!grr From: grr@cbmvax.UUCP Newsgroups: comp.arch Subject: Re: Using a DMA chip in strange ways Message-ID: <1429@cbmvax.cbmvax.cbm.UUCP> Date: Wed, 18-Feb-87 02:14:42 EST Article-I.D.: cbmvax.1429 Posted: Wed Feb 18 02:14:42 1987 Date-Received: Thu, 19-Feb-87 18:52:54 EST References: <4343@columbia.UUCP> Reply-To: grr@cbmvax.UUCP (George Robbins) Distribution: world Organization: Commodore Technology, West Chester, PA Lines: 15