Re: bus on new IBMs

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Article #22623

#22623

From: Casey Cox
Date: Mon, 26 Feb 1990 18:57

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In article <gZtMl3q00j8586TAoM@cs.cmu.edu> Robert.Sansom@CS.CMU.EDU writes:
>Excerpts from mail: 23-Feb-90 bus on new IBMs Wm. Scott `. Draves@cs.b
>(446)
>> I read in Unix Today! that the new IBM RISCs used an improved MCA bus
>> that doubled its performance from 20Mb/s to 40Mb/s.  There is a
>> separate, higher performance, bus for memory.
>
>Shouldn't that be 20-40 MB/s (peak).
>
The new IBM RISCs have a new micro channel bus that supports the extended
streaming protocol that allows data to be transferred every 100ns.  This new
40 MB/sec is of course their peak transfer rate and I'm sure the sustained rate
is somewhat lower, but it has nothing to do with the old 20 MB/sec rate on
other machines without the streaming protocol.

-- 
Casey Cox
Ultra Network Technologies / 101 Daggett Drive / San Jose CA 95134
casey@ultra.com  ...!ames!ultra!casey  (408) 922-0100

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!brutus.cs.uiuc.edu!jarthur!bridge2!mips!ultra!casey
From: casey@ultra.com (Casey Cox)
Newsgroups: comp.arch
Subject: Re: bus on new IBMs
Message-ID: <1990Feb26.185737.9409@ultra.com>
Date: 26 Feb 90 18:57:37 GMT
References: <WSD.90Feb22202840@pitman.cs.brown.edu> <gZtMl3q00j8586TAoM@cs.cmu.edu>
Reply-To: casey@ultra.com (Casey Cox)
Organization: Ultra Network Technologies
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