Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!ucsd!ucrmath!rhyde
From: rhyde@ucrmath.ucr.edu (randy hyde)
Newsgroups: comp.sys.apple2
Subject: Re: Adding an MMU- the whole hullabaloo
Message-ID: <10805@ucrmath.ucr.edu>
Date: 29 Dec 90 05:51:24 GMT
References: <311@generic.UUCP>
Organization: University of California, Riverside
Lines: 11

>> Do you mean Page (in the 4k context)?

Yep.  Or whatever page size you prefer.  I think that 64K is a little
large for a PMMU.  You'd spend all day swapping pages.

>> Suppose FLAG were in a swapped segment, how would ASL Flag work?

ASL is a R-M-W operation.  On the read you'd get an abort.  After swapping
in the appropriate page, the memory manager would *restart* the ASL instr.
allowing it to finish properly.  Since ASL has *not* yet modified the flag
(only does so on the write operation) things are okay.