home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky comp.sys.ibm.pc.hardware:22379 comp.arch:8997
- Newsgroups: comp.sys.ibm.pc.hardware,comp.arch
- Path: sparky!uunet!usc!zaphod.mps.ohio-state.edu!sdd.hp.com!ux1.cso.uiuc.edu!news.iastate.edu!help.cc.iastate.edu!willmore
- From: willmore@iastate.edu (David Willmore)
- Subject: Re: Does a 487sx shut down the 486sx??
- Message-ID: <willmore.714417950@help.cc.iastate.edu>
- Sender: news@news.iastate.edu (USENET News System)
- Organization: Iowa State University, Ames IA
- References: <IeYSMJK00Voz8Vf8ZN@andrew.cmu.edu> <1992Aug19.212552.1@uncavx.unca.edu> <exuptr.352.714338827@exu.ericsson.se>
- Date: Fri, 21 Aug 1992 17:25:50 GMT
- Lines: 30
-
- exuptr@exu.ericsson.se (Patrick Taylor) writes:
- >Actually , our friend from Intel can correct me if I'm wrong, but my
- >understanding is that the device you are describing is the OverDrive chip.
-
- >The DX2 does not go in a "free slot", it is pin compatible with a regular
- >old DX chip. I have manuals from Intel which flat out state this. Document
- >numbers available on request.
- > - D Adams
- > - Patrick Taylor
-
- Ok, let me see if I have this right. The 486DX has the cpu core with
- an fpu and an 8K I/D cache on one chip. The 486SX used to be 486DXs
- which had fpu's which failed to pass test, but are now a die that is
- specific only to them. The 486DX and 486SX are not pin compatible.
- The 486DX2 is an internally clock doubled processor which is otherwise
- just like a 486DX of half the processor speed.
-
- Next comes the RapidCad which (I guess) is a 486DX in a 386DX disguise.
- My guess is that there is a modified 486DX in the 386DX's place and
- some kind of dongle in the 387 socket. I'm not sure on this one at all.
-
- Finally there is the OverDrive chip, which, as I understand (read guess),
- is a DX2 in a special socket that is supposed to be included on 486SX
- motherboards? Of this last part, I am least sure.
-
- Does anybody know for sure what all these chips are? Someone from Intel?
- Dennis, maybe?
-
- --David Willmore
- willmore@iastate.edu
-