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- From: ti@bazooka.amb.org (Ti Kan)
- Newsgroups: comp.sys.ibm.pc.hardware,comp.sys.intel,comp.sys.mac.hardware
- Subject: Re: 486SLC chip.... what it it?
- Message-ID: <1239@bazooka.amb.org>
- Date: 16 Dec 92 08:15:46 GMT
- References: <8f8d5m200WAL42H2tB@andrew.cmu.edu> <1992Dec13.033749.1675@ucsu.Colorado.EDU> <1992Dec13.060559.3867@en.ecn.purdue.edu> <Bz89I7.23u@hfglobe.intel.com>
- Reply-To: ti@bazooka.UUCP (Ti Kan)
- Followup-To: comp.sys.ibm.pc.hardware
- Organization: AMB Research Labs, Sunnyvale, CA.
- Lines: 58
-
- In article <Bz89I7.23u@hfglobe.intel.com> sting@hfglobe.intel.com (Joe Bennett) writes:
- >
- >As for why the 486SLC by Cyrix will not run NeXTStep, I think
- >something should be considered:
- >
- >NeXTStep is the first, to the best of my knowledge, 32 bit
- >anything for the general PC market since Cyrix and AMD started
- >their clone operations. I don't believe that Cyrix could have
- >possibly tested 32 bit stuff adequately, because there was very
- >little of it out there, and they were aiming for the entry level
- >market as well.
-
- What are you talking about? Many flavors of BSD, SVR3 or SVR4 UNIX
- for the PC architecture are true 32-bit (this includes BSDI, 386BSD,
- Linux, SCO, ISC, Dell, Consensys, Microport, UHC, USL, Altos....
- need I go on?). I have successfully installed and run both SCO
- and USL SVR4.2 Destiny on Cyrix 486DLC-based systems.
-
- >My feeling is, they booted up DOS, Windows, probably a flight
- >simulator and a spreadsheet, and said, "It's compatible" (okay,
- >I'm sure the tests were more involved than that, but that's the
- >general idea.)
-
- Maybe this is true for some motherboard vendors, but the Cyrix CPU
- is, to the best of my knowledge, 100% compatible with the Intel
- 486 as far as software is concerned. I have run many stress tests
- under UNIX on the Cyrix chip, with and without the internal cache
- enabled, and I have not been able to find a compatibility or
- functionality problem.
-
- >Now when Next ported their OS to the 486, they probably had to
- >do some tweaking to their compilers. This probably meant getting
- >an Intel 486 programmer's reference manual to do it. After fixing
- >a few bugs (either due to something undocumented in the manuals,
- >documented incorrectly, etc) they got the OS functional. These
- >nondocumented/incorectly documented things could be a partial
- >reason for what's causing NeXTStep not to run on the Cyrix chip.
-
- There are many "probably"s in your conjecture, and they are just that.
- I would conjecture that NeXT simply didn't have the resources to do
- exhaustive testing on the Cyrix and therefore will not support
- an untested platform. Seems pretty reasonable to me... but, this
- doesn't mean that NextStep will not run on a Cyrix. Has anyone
- actually tried it?
-
- >I really wouldn't be too surprised if other true 32 bit code for
- >the x86 family also had problems on the Cyrix part.
-
- Like I mentioned above, the Cyrix chip runs "true 32-bit code" just
- fine.
-
- -Ti
- --
- /// Ti Kan vorsprung durch technik
- /// AMB Research Laboratories, Sunnyvale, CA. USA
- /// ti@amb.org
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