Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!wuarchive!udel!mmdf
From: Dickson@system-m.az05.bull.com (Paul Dickson)
Newsgroups: comp.sys.amiga.emulations
Subject: Re: Mac-system 7.0
Message-ID: <55177@nigel.ee.udel.edu>
Date: 31 May 91 23:05:47 GMT
Sender: mmdf@ee.udel.edu
Lines: 19


          No no no no no ... Let me explain, you don't want to map CHIP 
     memory anywhere, CHIP memory is slow, because it is chip memory
     which means it is accessed by other co-processors (DMA for guys
     like the blitter et al.).

         On the other hand, the ROMS are slower than 32-RAMs, first 
     because they're ROMs and also because they're 16 bits.  Since the
     CPU is the only one to access them, it is nice to be able to use a
     MMU to map the ROMs (_not_ the CHIP memory!) into fast 32bits RAM.

         It is true that this unability will make quite a difference on
     most of the common operations, since mapping the ROMs in fast RAM
     does the trick, as far as most acceleration goes.

But the MMR does not need an MMU to protect a copy of AmigaDOS in RAM.
It has fast static RAM for this.  In fact, if you aren't running
AmigaDOS 2.0, half the static ram can be used as cache.  About the only
thing that can't be run on an Amiga with this stripped '030 is enforcer.