Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!ucsd!ucbvax!pnet91.UUCP!ericmcg
From: ericmcg@pnet91.UUCP (Eric Mcgillicuddy)
Newsgroups: comp.sys.apple2
Subject: Virtual memory
Message-ID: <9010102030.aa01011@generic.UUCP>
Date: 10 Oct 90 20:27:42 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 26

>What I'm doing is designing a virtual memory system for the GS.
>It's a simplistic type, with just a BASE and BOUNDS register.  But
>that's enough to do memory protection, and make all processes

>Jawaid Bazyar               | Blondes in big black cars look better wearing
>Senior/Computer Engineering | their dark sunglasses at night. (unk. wierdo)
>jb10320@uxa.cso.uiuc.edu    |      The gin, the gin, glows in the Dark!
>                            |                             (B O'Cult)

Copy cat! :)
I think you are going more for a demand paged memory memory management unit,
kinda like a 68851. Lots of luck, but I think you will have problems with the
multiplexed addressing/data lines of the 65816. Also make sure that it is pin
compatible with the 65816 socket on the motherboard and/or various accerators.
I expect you will also have to write some system software to handle page
faults.

On an unrelated topic, where can I find information on PIF's (Permanent
Intialization Files)? When these are loaded are the assigned stack space as
OMF files are or must it explicitly ask for stack/direct page space?i

Eric MCGillicuddy
Apple II Evangelist

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