Path: utzoo!attcan!uunet!cs.utexas.edu!asuvax!ncar!midway!ux1.cso.uiuc.edu!uxa.cso.uiuc.edu!jb10320
From: jb10320@uxa.cso.uiuc.edu (Desdinova)
Newsgroups: comp.sys.apple2
Subject: Re: Virtual memory
Message-ID: <1990Oct14.182607.29306@ux1.cso.uiuc.edu>
Date: 14 Oct 90 18:26:07 GMT
References: <9010102030.aa01011@generic.UUCP>
Sender: news@ux1.cso.uiuc.edu (News)
Organization: University of Illinois at Urbana
Lines: 46

In article <9010102030.aa01011@generic.UUCP> ericmcg@pnet91.UUCP (Eric Mcgillicuddy) writes:
>
>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.

   I'm not really looking for paging right now, that would be asking too
much of a hack.  Such a thing would have to be built in to the '816.
However, having a separate v-space for each process gets around the
problem of limited stack space (only 64K for the whole system currently-
but soon, limited only by the imagination!)
   My purpose in this massive hack is to get a very stable *NIX running
on the GS.  I've thought about applications towards GS/OS, and it looks
promising.  Each application can be given it's own bank 0 space...
i.e., the tool sets can be switched between programs with no problems.
Obviously, you want to have them all share the screen space, but
when you're talking HACK, anything is possible.

>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
Hmm, that's a good question. I've never seen it in my frequent perusal
of the man-space (? what did I just say), but of course, I wasn't looking
for it.  I would imagine that a permanent init is given it's stack by
the system, but maybe not.  I know TOL files aren't given stacks.

>Eric MCGillicuddy
>Apple II Evangelist

  Amen!  Long live the IIgs (Apple or not!)

>UUCP: bkj386!pnet91!ericmcg
>INET: ericmcg@pnet91.cts.com


--
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)
Apple II Users Unite! Storm the New Product Announcement and Demand Justice!