Article View: comp.arch
Article #20426Re: Re: MicroVAX emulation
From: Roger B.A. Klorese
Date: Tue, 21 Mar 1989 20:39
Date: Tue, 21 Mar 1989 20:39
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2102 bytes
In article <37515@bbn.COM> slackey@BBN.COM (Stan Lackey) writes:
>The MICROvax architecture does NOT include
>string instructions, other than MOVC3 (and MOVC5?). Some DEC-supplied
>software includes emulation to ease the transition. Generating the
>in-line emulation using a reduced instruction set is NO PROBLEM, right?
There *IS NO* MicroVAX architecture. There is a MicroVAX *implementation*
of the VAX architecture, which implements some instructions in software.
This is very different.
>1. The uVAX is NOT said to implement the VAX architecture.
I've never seen this claimed.
>2. MIPS, AMD, Intel, Motorola, Sun, etc. don't do your work for you either.
> I don't understand why it is OK for the RISC suppliers to supply
> reduced instruction sets, but if DEC does it it's evil.
Ours is not "reduced" as in an incompatible subset of our other products.
Our *architecture* is designed around instruction leanness. If we were to
release a system on which some of our instructions would not run in either
hardware or provided software, that would not be reduced, that would be
STUPID.
--
Roger B.A. Klorese MIPS Computer Systems, Inc.
{ames,decwrl,pyramid}!mips!rogerk 928 E. Arques Ave. Sunnyvale, CA 94086
rogerk@servitude.mips.COM (rogerk%mips.COM@ames.arc.nasa.gov) +1 408 991-7802
"Committing a gross indecency shows you do things in a big way." - J. Broughton
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!apple!vsi1!wyse!mips!rogerk From: rogerk@mips.COM (Roger B.A. Klorese) Newsgroups: comp.arch Subject: Re: Re: MicroVAX emulation Message-ID: <15665@winchester.mips.COM> Date: 21 Mar 89 20:39:41 GMT References: <807@microsoft.UUCP> <92634@sun.uucp> <13322@steinmetz.ge.com> <1133@auspex.UUCP> <12000@haddock.ima.isc.com> <1368@husc6.harvard.edu> <679@scaup.cl.cam.ac.uk> <12035@haddock.ima.isc.com> <687@scaup.cl.cam.ac.uk> <37515@bbn.COM> Reply-To: rogerk@mips.COM (Roger B.A. Klorese) Organization: MIPS Computer Systems, Sunnyvale, CA Lines: 28