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Article #13059Re: Using a DMA chip in strange ways
From: mac
Date: Mon, 23 Feb 1987 20:09
Date: Mon, 23 Feb 1987 20:09
8 lines
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1030 bytes
> 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)? Been done. I believe it was on the Univac 1100s. Used for plated-wire to core memory transfers, among other things.
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<1257@uvacs.CS.VIRGINIA.EDU>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!water!watnot!watmath!clyde!rutgers!seismo!esosun!ucsdhub!hp-sdd!ncr-sd!ncrcae!ece-csc!uvacs!macReferences:
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watnot!watmath!clyde!rutgers!seismo!esosun!ucsdhub!hp-sdd!ncr-sd!ncrcae!ece-csc!uvacs!mac From: mac@uvacs.UUCP Newsgroups: comp.arch Subject: Re: Using a DMA chip in strange ways Message-ID: <1257@uvacs.CS.VIRGINIA.EDU> Date: Mon, 23-Feb-87 15:09:32 EST Article-I.D.: uvacs.1257 Posted: Mon Feb 23 15:09:32 1987 Date-Received: Fri, 27-Feb-87 01:13:04 EST References: <4343@columbia.UUCP> Organization: U.Va. CS Department, Charlottesville, VA Lines: 8 Summary: DMA for memory moves