Article View: comp.sys.amiga.tech
Article #4891Re: Memory Protection!
From: Brian Witt
Date: Thu, 16 Aug 1990 04:59
Date: Thu, 16 Aug 1990 04:59
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3819 bytes
In article <13785@cbmvax.commodore.com> valentin@cbmvax (Valentin Pepelea) writes:
>In article <35789@ut-emx.UUCP> lshaw@walt.cc.utexas.edu (logan shaw) writes:
>>
>>> Another problem is that even if you provide the possiblity for new
>>> applications to run protected within the environment, the fact that older
>>> programs can still jog around the address space and wreak havoc, defeats
>>> the initial purpose.
> If you cannot provide 100% memory
>protection and recoverability, then you might as well not provide it at all.
>
>You might disagree, but remember, I'm always right. ;-)
>Indeed, coming out with a fully memory protected operating system which
>protects even old software, but remains compatible by presenting one of these
>requesters every time an illegal access happens, is technically possible.
>But these requesters would pop up several times per second, and would leave
>novice users rather confused.
>
>Another option would be to come up with an operating system that provides
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>full memory protection, but would allow the user to turn it on only optionally.
>Easy. But to evaluate the likelyhood of such a thing happening, you have to
>factory in the energy constant, the resistance ratio and the friction
>coefficient...
Uh, excuse me, but this is sounding like the reasoning behind
Microsoft's OS/2 after they looked at MS-DOS.... Things weren't
right for protected mode, window servers, and programs that required
more than 640K memory. (DOS and COMMAND.COM and such were taking over
90K themselves!)
What would a "protected mode OS" on the Amiga smell like?
Would a protected mode OS be viable for the Amiga market?
*** What is the Amiga Market ***
If you say the Amiga should compete in Markets similar to the PS/2
world, then I say: If there isn't an "AmigaDOS"-type OS that
has protected mode before Christmas 1991, I'm out of here. :-( :-( :-(
I bought the machine for Multi-tasking, and have enjoyed its
power and flexibility. However, the graphics and exec had stood
frozen almost since I bought the machine (dec 1985). I'm very jealous
of my friends with '386 clones showing me VGA graphics.
_The Concepts_ inside of OS/2 and Presentation Manager are "one-up" on
the Amiga. My personal opinion is kill it [OS/2] or lose it. Although
the NeXT cubes aren't really selling, their software will be showing up
on machines labeled I.B.M.
(Maybe my depression has been brought on by SIGGRAPH -- all those
pretty displays; 1020 x 800 x _so_ many colors.)
This is starting to get long... I'd like to see a capability based
O.S. similar to Amoeba (Andy Tannenbaum, et al). Maybe running NeWS..
14" to 25" displays, price starting about $5000. But that's not
an Amiga anymore.. :-(
>
>Valentin
>--
>The Goddess of democracy? "The tyrants Name: Valentin Pepelea
> - Ancient Chinese Proverb Claimer: I not Commodore spokesman be
--- President Hussein of Iraq isn't evil, he just wants America to carpool!
--- brian witt, brian@babbage.ecs.csus.edu
Technical Details
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<1990Aug16.045918.22715@csusac.csus.edu>Path:
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<1145.26bd4989@waikato.ac.nz> <13693@cbmvax.commodore.com> <hclausen.2309@adspdk.CBMNET> <13756@cbmvax.commodore.com> <35789@ut-emx.UUCP> <13785@cbmvax.commodore.com>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!jarthur!usc!sdd.hp.com!decwrl!ucbvax!ucdavis!csusac!usenet From: brian@babbage.csus.edu (Brian Witt) Newsgroups: comp.sys.amiga.tech Subject: Re: Memory Protection! Summary: shades of the Great OS/2 nearby Message-ID: <1990Aug16.045918.22715@csusac.csus.edu> Date: 16 Aug 90 04:59:18 GMT References: <1145.26bd4989@waikato.ac.nz> <13693@cbmvax.commodore.com> <hclausen.2309@adspdk.CBMNET> <13756@cbmvax.commodore.com> <35789@ut-emx.UUCP> <13785@cbmvax.commodore.com> Organization: California State University, Sacramento Lines: 66