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- Newsgroups: comp.arch
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!torn!nott!hobbit.gandalf.ca!dperks
- From: dperks@gandalf.ca (Dave Perks)
- Subject: Re: Any new instructions in a i486?
- Message-ID: <1992Dec15.042513.23969@gandalf.ca>
- Organization: Gandalf Data Ltd.
- References: <WAYNE.92Dec11164422@backbone.uucp> <9212130000.AA05447@iecc.cambridge.ma.us> <1992Dec14.134109.3367@fasttech.com> <edm.724366309@wrs.com> <1992Dec15.014650.24209@grebyn.com>
- Date: Tue, 15 Dec 1992 04:25:13 GMT
- Lines: 15
-
- In <1992Dec15.014650.24209@grebyn.com> richk@grebyn.com (Richard Krehbiel) writes:
-
- >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.
-
- Is it also possible that since the Intel 486 supports supervisor-mode write
- protection, it is is used to allow something like copy-on-write? If NeXT Step
- was designed to use this then the kernel would require fairly major changes.
-
- Of course, I know nothing about NeXT Step so I'm just speculating wildly.
- --
- Dave Perks | dperks@gandalf.ca | 73230.2156@compuserve.com
- Gandalf Data Limited | TEL 1-613-723-6500 x8765 | (not checked very often)
- Nepean, Ontario, Canada | FAX 1-613-226-1717 |
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