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1994-08-01
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Path: cdrom.com!barrnet.net!parc!biosci!agate!howland.reston.ans.net!usc!nic-nac.CSU.net!charnel.ecst.csuchico.edu!olivea!sgigate.sgi.com!fido.asd.sgi.com!globe.csd.sgi.com!tcobbs
From: tcobbs@sgi.com (Travis Cobbs)
Newsgroups: alt.games.doom
Subject: Re: SGI DOOM released for Irix v5.2
Date: 1 Aug 1994 22:48:52 GMT
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 30
Distribution: na
Message-ID: <31ju4k$but@enet1-globe.csd.sgi.com>
References: <31b4nv$9td@dcdmjw.fnal.gov> <wunner.775682372@nova> <CttMKy.A36@rahul.net> <wunner.775696501@nova>
NNTP-Posting-Host: schooner.csd.sgi.com
In article <wunner.775696501@nova>,
Guenter Wunner <wunner@nova.tat.physik.uni-tuebingen.de> wrote:
>Timothy Wilson <wilsont@rahul.net> writes:
>>>>You need a R4K or better to run this game - I was compiled on an Indy and
>>>>therefore a R3K can not run it (different architectures).
>>>Huh?!?! And what about the famous binary compatibility that is praised in
>>>every info-sheet from SGI?!
>>> Lukas.
>>I think thats backwards compatibility.
>>like a 68030 will run 68000 programs.
>>(4600s run r4000, etc.)
>
>Naaaah! They claim that all machines are binary compatible, which is, for most
>programs, true - up to now, Doom is the only exception I have ever seen...
> Lukas.
If you look in the man page for cc, you will find the option "-mips2". This
option enables R4000-specific extensions, which presumably will usally result
in faster execution. You can also do a "man mips2" for more information. If
you do "file sgixdoom", you get:
sgixdoom: ELF 32-bit MSB mips-2 dynamic executable MIPS - version 1
^^^^^^
Any time you see this it indicates that the program has been compiled with the
-mips2 flag, and will not run on anything less than an R4000. Most programs
are compiled without this flag, and therefore work on R3000 machines.
Incidently, I have seen at least one other exception.
--
Travis Cobbs
tcobbs@schooner.csd.sgi.com Mountain View, CA
Silicon Graphics, Inc. phone: 415 390-2107