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Article #10941Re: Any new instructions in a i486?
From: Dave Perks
Date: Tue, 15 Dec 1992 04:25
Date: Tue, 15 Dec 1992 04:25
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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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Newsgroups: comp.arch Path: arc1-ca.pugleaf.net!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