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From: ching@brahms.amd.com (Mike Ching)
Newsgroups: misc.forsale,misc.forsale.computers,comp.sys.ibm.pc.misc,misc.wanted
Subject: Re: BUYERS! Beware Jason Galanter!
Message-ID: <1991Mar14.214510.2471@amd.com>
Date: 14 Mar 91 21:45:10 GMT
References: <2188@wet.UUCP> <1991Mar11.025410.24083@gsm001.uucp>
Sender: usenet@amd.com (NNTP Posting)
Organization: Advanced Micro Devices; Sunnyvale, CA
Lines: 34

In article <1991Mar11.025410.24083@gsm001.uucp> gsm@gsm001.uucp (Geoffrey S. Mendelson) writes:
>
>I posted this since there is usefull information for everyone in my reply.
>
>
>pk@wet.UUCP (Philip King) writes:
>> 
>>The above-named person, Jason Galanter (n3hnr@hpb.cis.pitt.edu) has
>>posted several ads to the net regarding computer items for sale.
>>
>>I unfortunately bought an 80287 coprocessor from him which turned
>>out to be not exactly as advertised.  He advertised an 80287-12,
>>and shipped the CMOS part- 80C287-12...which prevents my computer
>>from booting up.
>>
>
>You may be the first person in the world to have this problem.  The 80c287
>is a CMOS 80287. The only difference is the NMOS (80287) uses about 10 times
>the power as the CMOS.  Either there is a problem with your computer, the
>chip is defective, or it is in upside down.  I've had that happen to me with
>poorly marked mother boards. When I say upside down, I mean the high numbered
>pins where you want pin 1, not with the pins pointing up.

[stuff deleted]

I found this reply to be insulting especially since the information is
inaccurate. The Intel 80C287 is NOT a CMOS 80287. It uses the 80387 core
with an interface compatible to the 80287. Although it is possible to design
a board to accept either the 80C287 or 80287, one that is not designed
with both parts in mind will likely not work. Differences include no
connect pins being changed to power and ground pins in the C287 and the
clock divider being changed to divide by 2 instead of divide by 3.

Mike Ching