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- From: zeke@fasttech.com (Bohdan Tashchuk)
- Newsgroups: comp.arch
- Subject: Re: Any new instructions in a i486?
- Message-ID: <1992Dec14.134109.3367@fasttech.com>
- Date: 14 Dec 92 13:41:09 GMT
- Article-I.D.: fasttech.1992Dec14.134109.3367
- References: <WAYNE.92Dec11164422@backbone.uucp> <9212130000.AA05447@iecc.cambridge.ma.us>
- Organization: Fast Technology
- Lines: 38
-
- >>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.
-