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From: lane@cs.dal.ca (John Wright/Dr. Pat Lane)
Newsgroups: comp.os.msdos.desqview,comp.os.msdos.misc
Subject: Another QEMM problem.
Summary: Possible conflict between QEMM & DOS's FASTOPEN?
Message-ID: <1991May3.205700.8459@cs.dal.ca>
Date: 3 May 91 20:57:00 GMT
Organization: Math, Stats & CS, Dalhousie University, Halifax, NS, Canada
Lines: 40


Hmm.  I guess I'll jump in here with another slightly off-topic question.

I've noticed that when running with QEMM (any version) or 386MAX under
DOS 4.01, that I frequently get system crashes that go something like:
	"Protection Violation at CP:031B"      or
	"Protected Mode Operation at CP:031B"
etc.  Apparently this is caused by the CPU running into an instruction
which is only valid under protected mode.  The address always points
to FASTOPEN (the IP part is always the same), regarless of whether it was
loaded in high memory or not.

I'm led to suspect that FASTOPEN has a serious bug that causes it to trash
part of itself after so many file opens and on the next file open, you
execute the trash and, of course, crash.  Needless to say, Microsoft refuses
to admit to any such bug.

This has happened to me on many different systems where I've run QEMM (or
386MAX) and FASTOPEN together.  Taking FASTOPEN out takes away the problem.
I wonder if, with FASTOPEN but no QEMM, I would still be crashing but not 
getting the error message from QEMM.  I does seem to happen to me alot more
than other people who use the same system.  I wonder if it could be my heavy
usage of WPCorp's PE editor which is one program I know of that still uses
FCB file opens?

So has this happened to anyone else or does anyone have a clue what the
problem might be?  I realize it's a pretty weirdo problem.

Getting further off the topic, does anyone have an opinion on the merits
of FASTOPEN in general, especially combined with SMARTDRV, BUFFERS= and
other various caching mechanisms?

Any info will be appreciated.  If you can, please mail me a copy of anything
you post in response to this.  Thanks.

-- 

John Wright      ////////////////////////   If it's not Scottish, it's CRAP!!!
Post: c/o Dr Pat Lane, Biology Dept, Dalhousie U, Halifax N.S., CANADA B3H-4H8 
Internet: lane@cs.dal.ca   Uucp: lane@dalcs.uucp or {uunet watmath}!dalcs!lane