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From: janeri@Lise.Unit.NO (Jan Eri)
Newsgroups: comp.windows.ms,comp.sys.ibm.pc.misc
Subject: Re: OS/2 2.0 is here!  READ THIS, you'll be impressed
Message-ID: <1991Apr22.173716.10723@ugle.unit.no>
Date: 22 Apr 91 17:37:16 GMT
References: <1991Apr21.135534.724@jarvis.csri.toronto.edu> <1991Apr21.194928.8267@ux1.cso.uiuc.edu> <1991Apr21.175529.2386@jarvis.csri.toronto.edu>
Sender: news@ugle.unit.no
Reply-To: janeri@lise.unit.no
Organization: Norwegian Institute of Technology
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In article <1991Apr21.175529.2386@jarvis.csri.toronto.edu>, wayne@csri.toronto.edu (Wayne Hayes) writes:

|>
|> But yes, it runs DOS apps in a
|> window, just like Windows 3.0 in 386 enhanced mode can.  And you weren't
|> listening when I said that it will run Windows 2.x and 3.x applications
|> NATIVELY, ie WITHOUT starting up a DOS box, *side by side* with "real"
|> OS/2 applications under Presentation Manager.  I'm not sure about graphics
|> programs; I've read so much info internally over the past 2 days.  I
|> *do* recall someone talking about a bug being fixed that allowed some
|> graphics programs to be *displayed* under PM.  In fact Windows 3.0 in
|> enhanced mode can display DOS graphics programs in a window -- it can't
|> *run* them all because most do direct writes to the video RAM and thus
|> can't run concurrently with Windows.  I suspect PM (Presentation Manager, 
|> the window manager for OS/2) has similar limitations.  You probably wouldn't
|> want to do this anyway.  Trapping I/O instructions for writing out blocks
|> of data to disk and translating to OS/2 calls can be done fairly efficiently.
|> But trapping individual machine language instructions that access video
|> memory would be incredibly slow no matter how smart you did it.  Windows 3.0
|> can simulate CGA on my SuperVGA screen, but the graphics run 11 times
|> slower (I just timed it using Fractint).

NO, OS/2 Presentation Manager does not have the same limitations as
Windows 3.0 in Enhanced mode. You can RUN several dos programs with graphic
output at the same time without problems.

Jan Eri - - - The Norwegian Institute of Technology
janeri@lise.unit.no