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From: sonny@charybdis.harris-atd.com (Bob Davis)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: Experience with bargain 80287
Message-ID: <4047@trantor.harris-atd.com>
Date: 31 Jul 90 13:31:14 GMT
References: <12085@sdcc6.ucsd.edu>
Sender: news@trantor.harris-atd.com
Reply-To: sonny@trantor.harris-atd.com (Bob Davis)
Organization: Advanced Technology Dept., Harris Corp., Melbourne, Fl.
Lines: 57
X-Local-Date: 31 Jul 90 06:31:14 PDT

In article <12085@sdcc6.ucsd.edu> heirich@beowulf.ucsd.edu (Alan Heirich) writes:
>About a month ago someone posted information about bargain priced
>80287.  If I recall correctly, they were available for $100 each
	[DELETIONS]
>Has anyone had experience using one of these chips in a 12 MHz AT?
>If so, can you you tell us if you had any problems, and repost the
>address/phone number of the supplier?
>

HERE IS INFO I SENT A WHILE BACK TO OUR LOCAL PC USERS:

Date: Mon, 2 Jul 90 11:22:52 EDT
Subject: CHEAP ($99 half-price) 80C287 Math Coprocessors

Call AMD at 1-800-888-5590 about their $99 deal on 10 MHz
80C287 Coprocessors. Saw this in #30005 comp.sys.ibm.pc.
Accept VISA, MC.
AMD = Advanced Micro Devices, Inc. Austin, TX
These are CMOS chips requiring less power than vanilla 80287.
The going rate in Computer Shopper
for the last several months has been $215 or so.
These are 10 mHz chips, suitable for use with 80286 running
12 mHz or less.
Compatible with Intel 80287 (but NOT with 80287A for some reason).
30 day warranty. They will refund money for defective chip within
first 30 days.
LIFETIME GUARANTEE: After 30 days, AMD will replace defective chip.
I could not resist. +6% tax + $6 regular mail shipping.

I RECEIVED THE CHIP VIA REGULAR MAIL IN 10 DAYS AND THEN POSTED
THIS LOCALLY:

	I installed the AMD 10MHz 80C287 Math Coprocessor
in my 12MHz 80286 machine last night. This chip, which
AMD is currently selling for $99 (compare INTEL 80287 @ $210),
passes INTEL's CHKCOP v. 2.00 Coprocessor diagnostic. It also
passes MicroWay's 87TEST 8087 diagnostic. AMD's chip is touted as
being completely compatible with the INTEL 80287.
	I ran my benchmark of 128 1024-point FFT's after installing
the 80C287 and got the following results:

	No Coprocessor : 945 seconds
      With Coprocessor : 202 seconds

This represents a speedup by a factor of 4.7.

	The AMD 80C287 CMOS coprocessor felt barely warm
to the touch.
	So far, I'm happy.


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