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From: johnson@uiucdcsp.cs.uiuc.edu
Newsgroups: comp.arch
Subject: Re: Free Software Foundation (was: Re:
Message-ID: <76700006@uiucdcsp>
Date: Sat, 3-Oct-87 12:19:00 EDT
Article-I.D.: uiucdcsp.76700006
Posted: Sat Oct  3 12:19:00 1987
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Nf-From: uiucdcsp.cs.uiuc.edu!johnson    Oct  3 11:19:00 1987


>Virtual memory == ability for a task to run without its entire address space
>residing in primary memory, in a manner that is transparent to the task
>itself.

This answer would be marked as incorrect in the O.S. class that I teach.

> The test for virtual memory is whether the name space of the process is
> independent of the name space of the processor; that is, the memory seen by
> the process is the same, no matter where it is located in physical (real)
> memory.

This answer would be judged correct.

I suppose that either answer could serve as a definition for virtual memory,
but you have to pick one and use it.  Perhaps it depends on the text book
that you use.  The definition that you use determines whether you think
that the PDP-11 has virtual memory or not.