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From: phil@pepsi.amd.com (Phil Ngai)
Newsgroups: comp.sys.ibm.pc
Subject: Re: RE programs crashing in Desqview
Message-ID: <29391@amdcad.AMD.COM>
Date: 6 Mar 90 19:12:39 GMT
References: <48e591a9.20b6d@apollo.HP.COM> <29312@amdcad.AMD.COM> <4170@hub.UUCP> <7026@tekgvs.LABS.TEK.COM>
Sender: news@amdcad.AMD.COM
Reply-To: phil@pepsi.AMD.COM (Phil Ngai)
Distribution: usa
Organization: Advanced Micro Devices, Inc. Sunnyvale CA
Lines: 25

In article <7026@tekgvs.LABS.TEK.COM> keithe@tekgvs.LABS.TEK.COM (Keith Ericson) writes:
|In article <29312@amdcad.AMD.COM> phil@pepsi.amd.com (Phil Ngai) writes:
|
|>   In principle a 386 PC should be able to run DOS jobs in a 
|>   virtual 8086 and any crashes should not affect the other jobs.
|>   In practice I do not know if DV does this.
|
|I dunno' about  Desqview, but that's eggactly how VM/386 works.  If

That is what I would expect VM/386 to do. Someone replied that DV/386
does too. I do not believe this for the following reasons. First,
DV/386 is simply DV/286 packaged with QEMM-386. It's the same DV file
that you run although it may be possible that it executes different
code. Second, I have had plenty of crashes in DV/386 and if it were
really a virtual 8086 machine I would expect much fewer.

In summary, I believe that if you use DV/386, the only part which
runs in protected mode is QEMM-386. And I'm not even sure about that.
Someone told me that QEMM can do what it needs (to the MMU?) in
real mode. But I don't really believe this either.


--
Phil Ngai, phil@amd.com		{uunet,decwrl,ucbvax}!amdcad!phil
A PC without DESQview is like Unix without ^Z.