Thread View: comp.sys.ibm.hardware
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Started by Milind D Paranjpe
Tue, 28 Jul 1992 04:45
Can I use 8087 on 80286 motherboard?
Author: Milind D Paranjpe
Date: Tue, 28 Jul 1992 04:45
Date: Tue, 28 Jul 1992 04:45
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I finally upgraded from an 8088 to an 80286. Can I use my 8087 on the new motherboard? I noticed that the motherboard has a 14.31818MHz crystal near the 80287 socket. Does this mean that the coprocessor actually runs at 4.77MHz? Thanks for email responses, (and sorry if this is an FAQ) Milind Paranjpe paranjpe@leland.stanford.edu
Re: Can I use 8087 on 80286 motherboard?
Author: Milind D Paranjpe
Date: Thu, 30 Jul 1992 19:17
Date: Thu, 30 Jul 1992 19:17
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In article <1992Jul28.044519.9681@leland.Stanford.EDU> paranjpe@leland.Stanford.EDU (Milind D Paranjpe) writes: >I finally upgraded from an 8088 to an 80286. Can I use my 8087 on the new >motherboard? I noticed that the motherboard has a 14.31818MHz crystal near >the 80287 socket. Does this mean that the coprocessor actually runs at >4.77MHz? > The following cobinations are possible 8086 and 8088 with 8087 80186 and 80188 with 8087 (need a special chip for signal decoding) 80286 with 80287 80386 with 80287 (not for 386 mode) 80386 with 80387 80386SX with 80387SX 80486SX with 80487SX Frank +-----------------------------------------------------------------------------+ | eMail | Frank.Klemm@Physik.Uni-Jena.de || pfk@hpux.rz.uni-jena.de | | sMail | Frank Klemm, Wiesestr. 27, D-O-6500 Gera, Germany/Europe | +-----------------------------------------------------------------------------+ | "Aber Herr Student, das X kommt doch vor dem Y!" | | "Nein, Herr Professor, das X kommt nach dem Y!" | | "Ja, aber wie kommen Sie aber darauf?" | | "Ja, wie wollen Sie das Wort Syntax schreiben, damit das X vor dem Y steht?"| +-----------------------------------------------------------------------------+ | Die Frage ist doch: "Wo is der Kanzler" und nicht ... :-) | +-----------------------------------------------------------------------------+
Re: Can I use 8087 on 80286 motherboard?
Author: David LeCompte
Date: Fri, 31 Jul 1992 14:51
Date: Fri, 31 Jul 1992 14:51
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In article <1992Jul31.111725.21557@dragon.acadiau.ca> 900073s@dragon.acadiau.ca (Donald Smith) writes: [80x86 and 80x87 compatibilities deleted] > Yeah, and if anyone is bumb enough to buy an 80487, then I have a nice >big bridge to sell you... Or perhaps the Eiffel tower is more your speed?? > > The Math Co. for the 487 is *built in*..... My impression was that the 486SX was essentially the 486DX minus the math coprocessor. Have I been misled? I hate it when people misle me. :) -Dave -- --------------------- ObSig
Re: Can I use 8087 on 80286 motherboard?
Author: CHU JEFFREY
Date: Sat, 01 Aug 1992 00:23
Date: Sat, 01 Aug 1992 00:23
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>big bridge to sell you... Or perhaps the Eiffel tower is more your speed?? > > The Math Co. for the 487 is *built in*..... Yes, on the 486DX it has a built-in co-processor, but it also has a slot for another math co-processor called the Weitek 4167 (25/33). They price around $500.00 (last year cost wholesale cost). It is suppose do 3x the performance compare to the built-in co-processor. All 486DX (exception of a few) have the Weitek slot. My 486-25 last year didn't but when I got my 486-33DX last summer replacing the 486-25, it had the Weitek slot.
Re: Can I use 8087 on 80286 motherboard?
Author: Edward Quillen
Date: Sat, 01 Aug 1992 16:23
Date: Sat, 01 Aug 1992 16:23
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In article <1992Jul31.111725.21557@dragon.acadiau.ca> 900073s@dragon.acadiau.ca (Donald Smith) writes: >paranjpe@leland.Stanford.EDU (Milind D Paranjpe) writes: >>The following cobinations are possible >>8086 and 8088 with 8087 >>80186 and 80188 with 8087 (need a special chip for signal decoding) >>80286 with 80287 >>80386 with 80287 (not for 386 mode) >>80386 with 80387 >>80386SX with 80387SX >>80486SX with 80487SX > Yeah, and if anyone is bumb enough to buy an 80487, then I have a nice >big bridge to sell you... Or perhaps the Eiffel tower is more your speed?? > The Math Co. for the 487 is *built in*..... >-- > My .sig file was too long so I canned it. Mail me if you want it. *NOT!* > 900073s@dragon.acadiau.ca This is not a FLAME, but the 487 is not built into the 486SX. +++++++++++++++++++++++++++++++++++++++++++++++++ +++ ED (Edward Quillen) 6-1293 +++ +++ Vet Teaching Hosp. Asst. Manager +++ +++ Email: quillen@cps.msu.edu +++ +++ EOQ@vthnw.cvm.msu.edu +++ +++ eoq@vthvax.cvm.msu.edu +++ +++++++++++++++++++++++++++++++++++++++++++++++++
Re: Can I use 8087 on 80286 motherboard?
Author: Patrick Taylor
Date: Sun, 02 Aug 1992 23:42
Date: Sun, 02 Aug 1992 23:42
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In article <1992Jul31.111725.21557@dragon.acadiau.ca> 900073s@dragon.acadiau.ca (Donald Smith) writes:
>Xref: exucom.exu.ericsson.se comp.sys.ibm.pc:892 comp.sys.ibm.pc.hardware:19884 comp.sys.ibm.pc.misc:12377
>Newsgroups: comp.sys.ibm.hardware,comp.sys.ibm.pc,comp.sys.ibm.pc.hardware,comp.sys.ibm.pc.misc
>Path: exucom.exu.ericsson.se!ericom!sunic!mcsun!uunet!sun-barr!cs.utexas.edu!convex!news.utdallas.edu!corpgate!bnrgate!nrcnet0!cunews!torn!csd.unb.ca!morgan.ucs.mun.ca!nstn.ns.ca!dragon.acadiau.ca!900073s
>From: 900073s@dragon.acadiau.ca (Donald Smith)
>Subject: Re: Can I use 8087 on 80286 motherboard?
>Message-ID: <1992Jul31.111725.21557@dragon.acadiau.ca>
>Organization: Acadia University
>References: <1992Jul28.044519.9681@leland.Stanford.EDU> <1992Jul30.191748.29517@leland.Stanford.EDU>
>Date: Fri, 31 Jul 1992 11:17:25 GMT
>Lines: 20
>paranjpe@leland.Stanford.EDU (Milind D Paranjpe) writes:
> Yeah, and if anyone is bumb enough to buy an 80487, then I have a nice
>big bridge to sell you... Or perhaps the Eiffel tower is more your speed??
> The Math Co. for the 487 is *built in*.....
>--
> My .sig file was too long so I canned it. Mail me if you want it. *NOT!*
> 900073s@dragon.acadiau.ca
Please take your foot out of your mouth. The _486_SX_ does *NOT* have a
coprocessor built in, and that is what the 80487 SX is for.
"This must be Thursday. I never could get the hang of Thursdays" - D Adams
- Patrick Taylor
Ericsson Network Systems exuptr@exu.ericsson.se "Don't let the .se fool you" alternately, exuptr@ZGNews.Lonestar.Org
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