Article View: comp.arch
Article #3165Re: I/O, I/O, and off to work I go...
From: Peter da Silva
Date: Mon, 27 Nov 1989 15:37
Date: Mon, 27 Nov 1989 15:37
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Two busses so DMA doesn't conflict with the CPU? The Amiga's had it since 1985. The major I/O processors (the Copper and Blitter) are limited to below the 512K line, and extra memory (FAST RAM) goes on a seperate bus. Other DMA devices may conflict with FAST RAM up to the 16 MB limit of the 68000, but the 68020 and 68030 can access memory beyond that (up to 64 MB of it on the current 68030 with an (as yet non-existant) daughterboard). Pretty good for a $1000 box. -- `-_-' Peter da Silva <peter@ficc.uu.net> <peter@sugar.lonestar.org>. 'U` -------------- +1 713 274 5180. "The basic notion underlying USENET is the flame." -- Chuq Von Rospach, chuq@Apple.COM
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uunet!ficc!peter From: peter@ficc.uu.net (Peter da Silva) Newsgroups: comp.arch Subject: Re: I/O, I/O, and off to work I go... Summary: Amiga raving. Hit N if you don't want to hear it. Message-ID: <7115@ficc.uu.net> Date: 27 Nov 89 15:37:58 GMT References: <1128@m3.mfci.UUCP> <1989Nov22.175128.24910@ico.isc.com> <3899@scolex.sco.COM> <10335@attctc.Dallas.TX.US> Reply-To: peter@ficc.uu.net (Peter da Silva) Distribution: usa Organization: Xenix Support, FICC Lines: 13