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Article #11109Re: ?Concurrent DMA possible on smarter PC buses (EISA/MCA/Localbus)
From: Chris Simonich
Date: Wed, 16 Dec 1992 21:17
Date: Wed, 16 Dec 1992 21:17
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In article <1gntdfINNu7@cbl.umd.edu> mike@cbl.umd.edu (Michael Santangelo) writes: >Can EISA, MicroChannel, or the new VESA LocalBus on PC's allow >multiple controllers plugged into them (say two smart bus mastering >SCSI disk controllers on one of these buses) xfer data simultaneously >to main memory (DMA)? > Generally, shared bus architectures are shared by time-division multiplexing. In short, only one device may use the "bus" at a time, so the answer to your question is No. There was a post about a new I/O architecture from Compaq. This architecture does allow multiple controllers to perform simultaneously. -- ====================================================== Christopher Simonich simonich@twisto.compaq.com Compaq Computer Corp. [713] 374-1898 ======================================================
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Newsgroups: comp.arch,comp.arch.storage Path: arc1-ca.pugleaf.net!sparky!uunet!elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!wotan.compaq.com!twisto.eng.hou.compaq.com!croatia.eng.hou.compaq.com!simonich From: simonich@croatia.eng.hou.compaq.com (Chris Simonich) Subject: Re: ?Concurrent DMA possible on smarter PC buses (EISA/MCA/Localbus) Message-ID: <1992Dec16.211712.13142@twisto.eng.hou.compaq.com> Keywords: EISA,MCA,Localbus,VESA,PC,IBM,smartIO Sender: news@twisto.eng.hou.compaq.com (Netnews Account) Organization: Compaq Computer Corp. References: <1gntdfINNu7@cbl.umd.edu> Date: Wed, 16 Dec 1992 21:17:12 GMT Lines: 18