Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!killer!texbell!uhnix1!sugar!peter
From: peter@sugar.uu.net (Peter da Silva)
Newsgroups: comp.sys.amiga.tech
Subject: Re: IRQ virus (and a personal note to Steve)
Message-ID: <3205@sugar.uu.net>
Date: 3 Jan 89 02:24:13 GMT
References: <5601@cbmvax.UUCP> <5602@cbmvax.UUCP> <10788@s.ms.uky.edu> <10795@s.ms.uky.edu>
Organization: Sugar Land Unix - Houston, TX
Lines: 22

In article <10795@s.ms.uky.edu>, sean@ms.uky.edu (Sean Casey) writes:
> In article <3200@sugar.uu.net> peter@sugar.uu.net (Peter da Silva) writes
  about multiuser protection...

> I SAID a protected mode operating system. You know, like different memory maps
> for each user so they can't clobber each other?

There is a difference between a protected O/S and a multiuser O/S. For example,
RSX-11 comes with multiuser protection as an option. If you don't get that
option, it comes up with (effectively) shells on all interactive ports and
everyone running in root. RSX-11, by the way, is another real-time O/S. It's
got a lot of similarity to AmigaDOS.

> Huh? Why do you say that? An '030 with MMU is certainly a lot faster
> than a PC. As the processors get faster, the system overhead becomes a
> smaller fraction of the available horsepower.

Real-time work, like Midi, is not compatible with a heavy-duty protected
virtual memory multi-user O/S. Let's see you run Midi on a SUN.
-- 
Peter "Have you hugged your wolf today" da Silva  `-_-'  Hackercorp.
...texbell!sugar!peter, or peter@sugar.uu.net      'U`