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- Newsgroups: comp.arch
- Path: sparky!uunet!news!wrs.com!edm
- From: edm@wrs.com (Ed McClannahan)
- Subject: Re: Any new instructions in a i486?
- Message-ID: <edm.724366309@wrs.com>
- Sender: news@wrs.com (News Manager)
- Nntp-Posting-Host: chaos
- Organization: Wind River Systems, Inc.
- References: <WAYNE.92Dec11164422@backbone.uucp> <9212130000.AA05447@iecc.cambridge.ma.us> <1992Dec14.134109.3367@fasttech.com>
- Date: Mon, 14 Dec 1992 20:51:49 GMT
- Lines: 70
-
- zeke@fasttech.com (Bohdan Tashchuk) writes:
-
- >>>NeXTStep is said to not run on the Cyrix 486 chips because "they are
- >>>not real 486's". No one has come up with a reliable reason _why_ NeXT
- >>>doesn't think they are "real 486's" or why NeXTStep won't run on them.
-
- >>I don't have any real data, but I expect the problem is that the Cyrix
- >>chip doesn't have a floating point unit. Next's own systems have all
- >>had standard FPUs, and reviews of NeXTStep say that it won't run on a
- >>486SX, only a DX.
-
- >A 10/21/92 semi-official net posting on NextStep claims it runs on SXs:
-
- > General Requirements:
- > CPU - 486 based PC Compatible Computer. This includes 486SX, 486DX,
- > 486DX/2. Future Intel Microprocessor designs in the x86 family will
- > also be supported. ISA or EISA expansion bus. 486DX and 486DX/2's are
- > recommended for better performance.
-
- > Will NeXTSTEP 486 run on the Cyrix 486SLC?
- > No. The Cyrix chip not a true 486.
-
- >I asked for an explanation of "true 486" in comp.sys.intel. A Next person
- >seemed to imply that Next didn't want to bother resolving the supervisor
- >state differences between the chips. Nothing very convincing. I had a theory
- >involving "arrogant propeller-heads", but the Next person didn't agree with it.
-
- >My guess is that NextStep is sluggish enough that Next saw no reason to bother
- >with the Cyrix parts, which are lower performance than Intel 486?Xs.
-
- >I've also seen Intel apologists and employees repeat the "not a 486" claim in
- >various groups. They've succeeded admirably in their primary goal, which is
- >to sow Fear, Uncertainty, and Doubt as widely as they can. What I haven't seen
- >yet is an explanation. I'll ask the question again here:
-
- > Please tell me exactly WHY the Cyrix isn't a 486? What is it that
- > Intel feels is the essence of a 486?
-
- > Let me say a priori that a response of "made or licensed by Intel"
- > isn't sufficient in and of itself.
-
- The jist I got was that NeXTstep wants to maintain compatible File Systems
- between 680X0 and X86 platforms. To do this, they needed to do a lot of
- byte swapping on the X86 platforms. Since the 486 has a simple instruction
- to do it while the 386 does not, NeXT just went with the 486. I think their
- justification was that you needed the horsepower of the 486 to run NeXTstep
- anyway - atleast when you only look at X86 processors from Intel! This
- assumption (of only considering Intel's product line) may, indeed, be the
- real culprit as I think the Cyrix ne-486 is quite capable of running NeXTstep
- from a performance perspective.
-
- Note: The above impressions come from a Bay Area Next Users Group (BANG)
- meeting I attended several months ago where the manager in charge
- of NeXTstep "486" gave a rather detailed talk on the product. I'm
- sorry I can't remember his name - but I do know he drives a 928 (or
- something similarly fast) with a licence plate reading "NEXT 486".
- He joked all night about choosing the 486 (and later the "586")
- because it is FFAASSTT - like his car, get it? BTW: I took this
- "486" decision to be yet one more indicator that NeXT does not
- target the mass market. They seem to have completely yielded the
- so-called "low end" to Microsoft, et. al. and are focusing on
- finding that niche between the Desktop PC and Technical Workstations.
- While they are certainly having some short-term success in this
- market, I think they are doomed! I'm reminded of a line from "Other
- People's Money" in which DeVito is explaining the folly of a strategy
- of "gaining market share in a shrinking market". The niche NeXT has
- staked out sure looks to me like one of those "shrinking markets".
-
- Ed "doom and gloom" McClanahan
-
-