Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!cs.utexas.edu!milano!titan!janssen@titan.sw.mcc.com
From: janssen@titan.sw.mcc.com (Bill Janssen)
Newsgroups: comp.society.futures
Subject: Re: Memories...
Message-ID: <1834@titan.sw.mcc.com>
Date: 29 Dec 88 22:38:53 GMT
References: <8812200325.AA12574@multimax.encore.com>
Sender: janssen@titan.sw.mcc.com
Reply-To: janssen@titan.sw.mcc.com (Bill Janssen)
Organization: MCC Software Technology
Lines: 11
In-reply-to: bzs@ENCORE.COM (Barry Shein)

Remember that the PDP-11/34 type of machine had more physical memory,
128KB, than program address space, 64KB.  The PDP-11/70 addressed this
problem with separate I&D space.

Virtual memory makes the size of physical memory less important.  When
the amount of physical memory goes above the sum of the virtual memory
requirements of all the processes, don't add any more.  The real restriction
on program size seems to be imposed by swap partitions.  Anybody running
a 500MB swap partition?  (Mine is 150MB).

Bill