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From: davidsen@steinmetz.steinmetz.UUCP (William E. Davidsen Jr)
Newsgroups: comp.sys.intel,comp.sys.ibm.pc
Subject: Re: Clock speed on those darn 80?87 chips ...
Message-ID: <7427@steinmetz.steinmetz.UUCP>
Date: Tue, 22-Sep-87 12:12:18 EDT
Article-I.D.: steinmet.7427
Posted: Tue Sep 22 12:12:18 1987
Date-Received: Thu, 24-Sep-87 06:44:53 EDT
References: <454@hubcap.UUCP> <17263@aero.ARPA> <7385@steinmetz.steinmetz.UUCP> <17428@aero.ARPA>
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Distribution: na
Organization: General Electric CRD, Schenectady, NY
Lines: 30
Keywords: 8087, 80287, et al those math processors ....
Xref: mnetor comp.sys.intel:356 comp.sys.ibm.pc:8152

In article <17428@aero.ARPA> coffee@aero.UUCP (Peter C. Coffee) writes:
|In article <7385@steinmetz.steinmetz.UUCP>...bill davidsen writes:
|>In article <17263@aero.ARPA> coffee@aero.UUCP (Peter C. Coffee) writes:
|>
|>|8088, 8086, and 8087 run at board clock rate.
|>|80286 runs at 1/2 board clock rate. I don't know about the 80386.
|>|80287 runs at 1/3 board clock rate. I don't know about the 80387.
|>
|>This isn't correct. The speed of the chip is not provided by the clock
|>fed to it...For example, there is a company which plugs an 80287 running
|>at 10MHz into the socket of an existing 80287.
|
|You're kidding, right? You never noticed the CRYSTAL(!!!!) on the little
|daughterboard that holds said 80287??? I specifically said, you can feed
|the numeric chip its own clock if you want to; and yes, the 8087's execution
|unit can also run asynchronously with its control unit.
|
|Geez Louise--plug the chip in to 5VDC and off it goes at 10MHz...wait til
|the crystal manufacturers find out about this...mutter, mutter.


Not only was this "quote" taken out of context, but it was also *edited*
to insure giving the incorrect information. I would have replied by
mail, but the offending posting has no signature and the purported
poster's address is returned to me as "no such user". My original text
is available by mail if anyone missed it.
-- 
	bill davidsen		(wedu@ge-crd.arpa)
  {uunet | philabs | seismo}!steinmetz!crdos1!davidsen
"Stupidity, like virtue, is its own reward" -me