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- From: x90wardell@gw.wmich.edu
- Newsgroups: comp.os.os2.advocacy
- Subject: Re: The Cyrix Issue...
- Message-ID: <1993Jan12.224901.7223@gw.wmich.edu>
- Date: 12 Jan 93 22:49:01 EST
- References: <Matt_Kievit.0c2d@abcd.Houghton.MI.US>
- Distribution: world
- Organization: Western Michigan University
- Lines: 61
-
- In article <Matt_Kievit.0c2d@abcd.Houghton.MI.US>, Matt_Kievit@abcd.Houghton.MI.US (Matt Kievit) writes:
- > In a message dated Tue 12 Jan 93 1:04, 177wardell@gw.wmich.edu wrote:
- >
- >>> What we have here is a basic disagreement. I have read in numerous
- >>>articles that the Cyrix 486 chip is exactly what was said above:
- >>>a 386sx with a 2K onchip cache and a few extra instructions that
- >>>are math related. It is NOT a 486 class processor (in terms of
- >>>compatibility).
- >>
- >>
- >> The Cyrix chips _are_ 486 chips. They have ALL of the 486
- >> instructions (bswap, etc).
- >>
- >> The differences between the 486SX and the 486SLC/DLC are:
- >>
- >> 1. The 486 has an 8k cache, the Cyrix chips have a _1_k cache.
- >> (not a 2k cache)
- >> 2. The 486 uses the 486 pinout, the Cyrix chips are drop in
- >> replacements for 386DX (DLC) and 386SX (SLC) chips.
- >> 3. the 486 has a built in FPU. The Cyrix chips implement the
- >> FPU externally, in the FastMath coprocessor.
- >>
- >> Obviously, none of the above differences have anything to do with
- >> compatibility with a 486SX or DX (if you add the coprocessor). they
- >> will result in performance differences, nothing more.
- >>
- >> If these are not "486 class processors" it is strictly a matter
- >> of performance, NOT compatibility.
- >
- > > I still stand by my original post (except I agree, it is a 1K
- > > cache, not 2K). I have read over and over again that Cyrix's 486SLC is
- > > only called a 486 for marketting reasons and that it is still basically
- > > a 386sx (16bit bus, 24bit address, tec) with a few added instructions.
- >
- > > -Brad
- >
- > I have right here in front of me, Compu Shopper, October, 1992, p 171:
- >
- > "The Cx486DLC comes with a 486 instruction set with 32-bit internal and
- > external data paths."
- >
- > In other words, it's a NEARLY EXACT i486, except for the 1k cache and the
- > fact that it fits into a 386 DX slot..
- >
- Key word in there is the 486DLC. I was talking about the
- 486SLC. I am not familiar with the DLC, are you CERTAIN it has been
- released yet?
-
- -Brad
-
-
-
-
- > ----------------------------------------------------------------------------
- >
- > Matt Kievit - Michigan Tech University - In the great U.P
- > ----------------------------------------------------------------------------
- >
- >
- > -- Via DLG Pro v0.995
- >
-