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- Path: sparky!uunet!haven.umd.edu!decuac!pa.dec.com!granite.pa.dec.com!ajc
- From: ajc@pa.dec.com (AJ Casamento)
- Newsgroups: comp.arch
- Subject: Re: COMPAQ PROPOSED SCALABLE I/O ARCHITECTURE
- Date: 16 Dec 92 17:55:42
- Organization: Digital Equipment Corporation
- Lines: 61
- Message-ID: <AJC.92Dec16175542@thendara.pa.dec.com>
- References: <1992Dec15.171554.2781@twisto.eng.hou.compaq.com>
- <1992Dec15.194637.10009@eng.umd.edu> <1992Dec15.205639.25591@super.org>
- NNTP-Posting-Host: thendara.pa.dec.com
- In-reply-to: rminnich@super.org's message of Tue, 15 Dec 1992 20:56:39 GMT
-
-
-
- In article <1992Dec15.205639.25591@super.org> rminnich@super.org (Ronald G
- Minnich) writes:
-
- >>In article <1992Dec15.194637.10009@eng.umd.edu> sysmgr@king.eng.umd.edu
- >>writes:
- >> >You guys ever thought of licensing TurboChannel from DEC and building a
- >> >Pentium box/server around it?
-
- >> TurboChannel is a dog.
-
- >> Actually, seems to me they could look at SCI. Except they want low cost.
- >> But if the CMOS chips for SCI pan out, maybe they will meet the cost
- >> range.
- >> ron
-
- Ron,
-
- I'm confused. Is there something to back this opinion up? Which machine or
- implementation are you discussing? For my own view of things TURBOchannel is
- the fastest shipping desktop interconnect in the market (with internal designs
- of network options that have sustained over 80MB/s under software control).
-
- If there are specific examples of issues you've seen with performance I'd be
- interested.
-
- The platform breakdown looks something like this:
-
- 12.5MHz 50MB/s 25MHz 100MB/s
-
- DS5000/20 DS5000/200
- DS5000/25 DS5000/240
- DS5000/33 DS5900
- DS5000/120 DEC3000/400 (actually 93MB/s)
- DS5000/125 DEC3000/500
- DS5000/133
-
- If you have questions about specific platform implementations (the numbers
- quoted are theoretical peak bandwidth, the highest I've seen a 12.5MHz system
- run is ~44MB/s and a 25MHz system is ~82MB/s). And the DS5000/200 started
- shipping in April of 1990.
-
- I hope that clears things up.
-
- Thanx,
- AJ
-
-
- ps. I haven't included the VS4000/60 or VS4000/90 on this as the TURBOchannel
- on those systems is a bridge adapter which is bounded in performance by the
- bus on the system module.
-
- **********************************************************************
- * AJ Casamento "The question is not whether or *
- * Digital's TRI/ADD Program not the opinions are mine; but *
- * 529 Bryant Ave. PAG-2 rather, which of my personalities *
- * Palo Alto, CA 94301-1616 do they belong to?" *
- * 415.617.3460 *
- * ajc@pa.dec.com *
- **********************************************************************
-