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- Newsgroups: comp.arch
- Path: sparky!uunet!grebyn!daily!richk
- From: richk@grebyn.com (Richard Krehbiel)
- Subject: Re: Any new instructions in a i486?
- In-Reply-To: edm@wrs.com's message of Mon, 14 Dec 1992 20:51:49 GMT
- Message-ID: <1992Dec15.014650.24209@grebyn.com>
- Lines: 21
- Sender: richk@grebyn.com (Richard Krehbiel)
- Organization: Grebyn Timesharing
- References: <WAYNE.92Dec11164422@backbone.uucp> <9212130000.AA05447@iecc.cambridge.ma.us>
- <1992Dec14.134109.3367@fasttech.com> <edm.724366309@wrs.com>
- Date: Tue, 15 Dec 1992 01:46:50 GMT
-
- In article <edm.724366309@wrs.com> edm@wrs.com (Ed McClannahan) writes:
-
- > 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.
-
- This would explain why they chose to require the 486 instruction set.
- It does not explain why NeXT Step 486 won't run on the Cyrix 486DLC,
- which *has* the BSWAP instruction, like an Intel 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.
-
- If the Intel 486SX-25 is powerful enough, then the Cyrix 486DLC-40
- certainly is, even considering the smaller cache.
- --
- Richard Krehbiel richk@grebyn.com
- OS/2 2.0 will do for me until AmigaDOS for the 386 comes along...
-