Evolution of Memory Protection and Virtual Memory

[Brian L. Stuart]

> I'm looking for reference materials regarding very early implementations 
> of virtual memory and/or memory protection.  I'm really most interested 
> in exploring the evolution of these features in operating systems.
> 
> Anyone have any pointers for me as to where to look for this information?

In addition to the other suggestions, don't forget Multics.
http://www.multicians.org has a wealth of material, including
the newly released source code.

BLS