Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!trantor.harris-atd.com!charybdis!sonny From: sonny@charybdis.harris-atd.com (Bob Davis) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: Info needed: AMD 80C287 chip Message-ID: <4749@trantor.harris-atd.com> Date: 2 Nov 90 17:50:58 GMT References: <1990Nov1.221515.15575@nntp-server.caltech.edu> Sender: news@trantor.harris-atd.com Reply-To: sonny@trantor.harris-atd.com (Bob Davis) Organization: Advanced Technology Dept., Harris ESS, Melbourne, FL Lines: 77 In article <1990Nov1.221515.15575@nntp-server.caltech.edu> xiaohe@nntp-server.caltech.edu (Xiao-He Zhang) writes: >Greetings! > >I am planning to add a co-processor for my AT compatible and just see this >287 chip (AMD 80C287) advertised in PC Mag at ~$100, manufactured by the >Advanced Micro Devices. This is far cheaper than an Intel 287 chip. It is >claimed to be compatible with Intel's 80287. My question is: is it true? >Any comments, experiences, suggestions? Thanks a lot in advance! > >X. Zhang From my E-mail Journal: Date: Mon, 2 Jul 90 11:22:52 EDT From: Bob Davis To: pc-users@trantor.harris-atd.com 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. (You probably will make it with 16Mhz machines). 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. ----------------- Date: Fri, 13 Jul 90 15:54:28 EDT From: Bob Davis To: pc-users@trantor.harris-atd.com Subject: AMD 80C287 Coprocessor 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 in this floating-point- intensive engineering application. The AMD 80C287 CMOS coprocessor felt barely warm to the touch. So far, I'm happy. ------------------------------------------------------------- ...and now, 4 months later, I remain happy. (Ecstatic, actually.) ______________________________________________________________________________ Bob Davis, UofALA'66 \\ INTERNET : sonny@trantor.harris-atd.com | _ _ | Harris Corporation, ESS \\ UUCP : ...!uunet!x102a!trantor!sonny |_| |_| | | Advanced Technology Dept.\\ AETHER : K4VNO |==============|_/\/\/\|_| PO Box 37, MS 3A/1912 \\ VOICE : (407) 727-5886 | I SPEAK ONLY | |_| |_| | Melbourne, FL 32902 \\ FAX : (407) 729-2537 | FOR MYSELF. |_________|