xiaohe@nntp-server.caltech.edu (Xiao-He Zhang) (11/02/90)
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
v087mxgb@ubvmsa.cc.buffalo.edu (Shawn E Thompson) (11/02/90)
you DO realize that the 80CX87 series chips are "COMPACT" -87's (for laptops, etc.) , right?? ST
carlson@gateway (Bruce Carlson) (11/02/90)
In article <1990Nov1.221515.15575@nntp-server.caltech.edu> xiaohe@nntp-server.caltech.edu (Xiao-He Zhang) writes: >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 The newest Byte magazine has a comparison of the coprocessors. A quick synopsis is that the AMD chip is good (compatible), but slightly slower performance than the Intel XL80287 or the IIT coprocessor chip. However, the AMD chip is about half the cost or less, so it may be worth it to give up a little performance. Bruce Carlson carlson@gateway.mitre.org
eakin@rsmas.miami.edu (11/02/90)
In article <43947@eerie.acsu.Buffalo.EDU>, v087mxgb@ubvmsa.cc.buffalo.edu (Shawn E Thompson) writes: > you DO realize that the 80CX87 series chips are > "COMPACT" -87's (for laptops, etc.) , right?? > > ST This is not quite true. The 80C287 is a CMOS equivalent to the 80287 chip. It can be used in laptops and desktops. I just ordered one of these from AMD and will post personal experiences next week. However, they have been tested in my model of computer, IBM PS/2 50z. Mark -- C. Mark Eakin Internet: Eakin@RSMAS.miami.edu Amateur Radio: N4SYK Packet Radio: N4SYK@AB4LU.FL.USA.NA USnail: Univ. of Miami, RSMAS-BLR, 4600 Rickenbacker Cswy. Miami, FL 33149-1098
sonny@charybdis.harris-atd.com (Bob Davis) (11/03/90)
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 <sonny@trantor.harris-atd.com> 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 <sonny@trantor.harris-atd.com> 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. |_________|
kls30@duts.ccc.amdahl.com (Kent L Shephard) (11/06/90)
In article <43947@eerie.acsu.Buffalo.EDU> v087mxgb@ubvmsa.cc.buffalo.edu (Shawn E Thompson) writes: > >you DO realize that the 80CX87 series chips are >"COMPACT" -87's (for laptops, etc.) , right?? > > > >ST You have got to be joking. COMPACT???????????? more like CMOS The 80CX87 | CMOS technology not standard TTL but still compatible because it has TTL output voltage levels. CMOS consumes less power than standard TTL. If you look at most chips these days they are using CMOS components with TTL signal levels (in/out). They put the CMOS to TTL interface (signal level conversion) in the IC. These chips will work in all systems. It just so happens that they will also work in laptops, etc because they consume LESS power. Less power consumption in a laptop means longer battery life. Kent. -- /* -The opinions expressed are my own, not my employers. */ /* For I can only express my own opinions. */ /* */ /* Kent L. Shephard : email - kls30@DUTS.ccc.amdahl.com */
phil@brahms.amd.com (Phil Ngai) (11/06/90)
In article <4749@trantor.harris-atd.com> sonny@trantor.harris-atd.com (Bob Davis) writes: |These are 10 mHz chips, suitable for use with 80286 running |12 mHz or less. (You probably will make it with 16Mhz machines). The 287 gets a clock 2/3 of the processor. Thus, 16*2/3 = 10.67 MHz. Now, I would never tell you to run the part past its spec, but if you did and it worked, I wouldn't be surprised. |Compatible with Intel 80287 (but NOT with 80287A for some reason). I think Intel added some 387 like features to their 287A. Whether any software USES it is another question. | 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. We use the same microcode. (I speak only for myself.) -- I voted. Did you?
rmk@frog.UUCP (Rick Kelly) (11/07/90)
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 Yes, AMD has a license to manufacture the 80C287 using Intel's mask. Rick Kelly Charles River Data Systems 508-626-1011 rmk@frog.UUCP
eakin@rsmas.miami.edu (11/07/90)
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 Just installed one last night in my PS/2 mod.50z. Our statistical calculation test (4way unequal ANOVA in SYSTAT) went from 5:42 (min:sec) to 0:51. Also considerable improvement in spreadsheets and others. Great deal for the price & 1-800 2nd day air service standard. Overnight available of course. Mark -- C. Mark Eakin Internet: Eakin@RSMAS.miami.edu Amateur Radio: N4SYK Packet Radio: N4SYK@AB4LU.FL.USA.NA USnail: Univ. of Miami, RSMAS-BLR, 4600 Rickenbacker Cswy. Miami, FL 33149-1098
xiaohe@nntp-server.caltech.edu (Xiao-He Zhang) (11/12/90)
Hi, all!
A few days ago, I posted a request for information on the AMD 80C287
chip. Thanks for all of you who responded. I ordered the chip the third
day when I saw so many positive postings and I just had the chip installed
two days ago. It works perfectly as claimed. Thank you!
Xiao-He Zhang