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- Date: Sun, 13 Mar 1994 08:44:27 -0800
- From: egsner!decwrl!decvax!gatech!netcom.com!ersmith@convex.convex.com (Eric R. Smith)
- Message-Id: <199403131644.IAA09772@netcom10.netcom.com>
- To: egsner!atari.archive.umich.edu!mint@terminator.rs.itd.umich.edu,
- ekl@sdf.lonestar.org
- Subject: Re: Memory Protection
-
- The MultiTOS AES is already marked as "special" for memory protection purposes.
- I can assure you that MultiTOS will run with memory protection (I do it
- all the time). However, it is possible that some desk accessories and/or
- TSRs can cause memory protection errors that will kill MultiTOS off; the
- screen manager is somewhat vulnerable to this.
-
- It is impossible to add an MMU to a 68000 because the 68000 has no way to
- restart an instruction that caused a bus error or similar memory fault.
- The only 68000 based machines I've heard of that run Unix actually use two
- 68000s, running in parallel; when one gets a memory fault, the other one
- can be used to restart the instruction. Trying to add something like this
- to an ST would be far more complicated than upgrading to a 68030, I'm sure :-).
-