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From: dillon@PAVEPAWS.BERKELEY.EDU (Matt Dillon)
Newsgroups: net.micro.amiga
Subject: MMu's
Message-ID: <8606081922.AA03584@pavepaws>
Date: Sun, 8-Jun-86 15:22:57 EDT
Article-I.D.: pavepaws.8606081922.AA03584
Posted: Sun Jun  8 15:22:57 1986
Date-Received: Mon, 9-Jun-86 06:44:07 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: University of California at Berkeley
Lines: 17


	MMU		-Memory Management Unit (either on the CPU board/chip or another 
			 co-processor.

	MAT		-Memory address translator (a VAT with huge page sizes)
	VAT		-Virtual address translator

	Additionaly, some processors support 'memory protection' via some internal
registers which simply supply a 'range' of allowed addresses.  The difference 
between this and a real MMU (MAT/VAT) is that it doesn't allow disjoint 
memory segments (or a limited number of disjoint memory segments)

	My personal opinion is that I wouldn't even think of implimenting UNIX
without an MMU.... I have no desire to wait 5+ minutes for the machine to
reboot every time a program crashes.

					-Matt