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- Newsgroups: comp.sys.amiga.hardware
- Path: sparky!uunet!mcsun!news.funet.fi!cc.tut.fi!mk59200
- From: mk59200@cc.tut.fi (Markku Kolkka)
- Subject: Re: '040 & '882
- Message-ID: <1992Aug21.113816.10956@cc.tut.fi>
- Organization: Tampere University of Technology, Finland
- References: <9208181730.AA00580@aitgw.ge.com> <1992Aug19.093028.16282@enea.se> <64364@cup.portal.com>
- Date: Fri, 21 Aug 92 11:38:16 GMT
- Lines: 16
-
-
- In article <64364@cup.portal.com> DonD@cup.portal.com (Don Robert DeCosta) writes:
- >Since the '040 has to emulate some '882 instructions with software, perhaps the
- >'040/'882 combo is legit... perhaps the '040 won't have to soft-emulate any
- >instructions, it can pass them on to the '882. Not as fast as having those
- >instructions on-chip, but faster than software.
-
- No, the 68040 doesn't have the coprocessor interface necessary for the
- external FPU (6888[12]). According to Motorola, the '040 can calculate
- the transcendental functions in software as fast as the 68881 does
- them in microcode, but they don't account for the time taken by
- an 'unimplemented instruction' trap.
-
- --
- Markku Kolkka
- mk59200@cc.tut.fi
-
-