home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.intel
- Path: sparky!uunet!mcsun!sunic!ericom!ericom!etlmike
- From: etlmike@jerry.ericsson.se (Mike Wilcox)
- Subject: Re: 486sx questions
- In-Reply-To: gt7080a@prism.gatech.EDU's message of 30 Jul 92 19:51:06 GMT
- Message-ID: <ETLMIKE.92Jul31183000@jerry.ericsson.se>
- Sender: news@ericsson.se
- Nntp-Posting-Host: jerry.ericsson.se
- Organization: Ericsson Ltd., Cellular Systems & Special Networks.
- References: <1992Jul27.135047.13578@nstn.ns.ca> <76814@ut-emx.uucp>
- <64705@hydra.gatech.EDU>
- Date: Fri, 31 Jul 1992 17:30:00 GMT
- Lines: 42
-
- In article <64705@hydra.gatech.EDU> gt7080a@prism.gatech.EDU (Nathan I. Laredo) writes:
-
- In article <76814@ut-emx.uucp> ifaq570@ccwf.cc.utexas.edu (Allen Kitchen) writes:
- >
- > Sorry bud, but to upgrade from the 486SX to the 486DX, you will
- >need to buy an entire new motherboard. Reason for this is that the SX is
- >a 16 bit memory bus, just like the 386. The DX is a 32 bit part, meaning
- .....
- particular motherboard. The 486SX is NOT 16 bits... it's a true 32
- bit chip, with the 8k on chip cache, as well as all the other features
- of the 486DX, only it runs at a slower clock and has the math coprocessor
- missing or disabled (depending on what intel now does).
-
- You might check to see if there are extra jumpers around the socket for
- the 486. If your motherboard only has a slot for a weitek math coprocessor,
- there's a good chance that it will support the processor upgrade since
- there's no slot for a 487. Motherboards that have this feature are usually
-
- Yup, I have to agree - I have a no-name motherboard, with a 486SX-20
- chip. It has a slot for a Weitek co-processor (which is a smaller
- socket than the 486SX's socket).
-
- The manual for this motherboard tells me which jumpers (there are 3)
- to use depending on which 486 I have. In fact, there is a set of
- jumper settings for having a 487SX around, but doesn't tell me how to
- set up the chips, & I haven't investigated this any further.
- Indeed the manual also tells me the various BIOS settings I should use
- depending on the speed of the chip, allowing for 486SX-20, 486SX-25,
- 486DX-33 and 486DX-50.
-
- So far I figure my best expansion path is to get rid of the 486SX-20
- sometime in the future, and replace it with a DX2 of some description
- and a new crystal. If anyone has any comments (+ve or -ve), I'd
- love to hear them.
-
- Mike
-
-
- --
- Mike Wilcox Guildford, Surrey, England.
- CME 20 Design Dept. Tel: +44-483-303666
- Ericsson Cellular Systems. Email: etlmike@deep-thought.ericsson.se
-