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- Sender: Postmaster@iecc.cambridge.ma.us
- Newsgroups: comp.arch
- Path: sparky!uunet!think.com!spdcc!iecc!mailgateway
- Subject: Re: Any new instructions in a i486?
- References: <WAYNE.92Dec11164422@backbone.uucp>
- Organization: I.E.C.C.
- Date: 13 Dec 92 00:00:19 EST (Sun)
- From: johnl@iecc.cambridge.ma.us (John R. Levine)
- Message-ID: <9212130000.AA05447@iecc.cambridge.ma.us>
- Lines: 13
-
- >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. Display Postscript apparently does a lot of floating
- arithmetic, so I'd imagine the performance hit for simulated FP could be
- severe.
-
- Regards,
- John Levine, johnl@iecc.cambridge.ma.us, {spdcc|ima|world}!iecc!johnl
-