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Article #7204Re: Is 68020 + 68851 == 68030
From: Dave Haynie
Date: Thu, 26 Oct 1989 19:27
Date: Thu, 26 Oct 1989 19:27
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1283 bytes
in article <1178@lzsc.ATT.COM>, mkg@lzsc.ATT.COM (Marsh Gosnell) says:
> Is there any difference (other than a wait state) between a 68020 and
> the MMU and a 68030? This question came up at a user group meeting and
> I'd like to get the answer.
They're practically the same, software-wise. There are some 68851 instructions
and addressing modes that aren't supported by the 68030 (these can be emulated,
but it's better to use the 68030 subset, and most folks do), and the 68030 has
two transparent translation registers that aren't supported by the 68851. The
big change in MMUs comes with the 68040....
> Marsh Gosnell mkg@lzma.att.com
--
Dave Haynie Commodore-Amiga (Systems Engineering) "The Crew That Never Rests"
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arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!cbmvax!davehReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!cbmvax!daveh From: daveh@cbmvax.UUCP (Dave Haynie) Newsgroups: comp.sys.mac Subject: Re: Is 68020 + 68851 == 68030 Message-ID: <8297@cbmvax.UUCP> Date: 26 Oct 89 19:27:31 GMT References: <1178@lzsc.ATT.COM> Organization: Commodore Technology, West Chester, PA Lines: 17