Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!think!ames!excelan!gerry
From: gerry@na.excelan.com (Gerry Reynolds)
Newsgroups: comp.windows.ms
Subject: Re: Above EMS simulator and MS Windows
Message-ID: <789@excelan.COM>
Date: 29 Nov 89 01:59:34 GMT
References: <2268@moondance.cs.uq.oz>
Sender: news@excelan.COM
Reply-To: gerry@na.excelan.com (Gerry Reynolds)
Organization: Excelan, Inc., San Jose, Califonia
Lines: 31

In article <2268@moondance.cs.uq.oz> ant@batserver.cs.uq.oz writes:
>I have an AT clone with 2Meg of memory, 640K standard and the rest extended.
>I am currently looking at the Above EMS simulator to use 1M of my extended
>memory as EMS.  My primary use for this would be with Windows 2.11.

    We use Quarterdeck's expanded memory manager for 386's and that
    works fine with Windows/286. I assume Quarterdeck has a version
    that runs on 286 machines. I've seen some expanded memory emulators
    that work with Windows and some that don't. 
>
>Has anyone out there had any success with this combination ?  How exactly
>does MS Windows use EMS anyhow ?  Other programs seem to be able to use the
>simulated EMS ok (PCtools for example), but all I get from windows is
>windows with 70K less real memory than it normally has.

Windows/286 and Windows/386 use expanded memory in the same manner and  
that is to bank switch different windows applications in and out of the
first megabyte of memory. Whenever you load a windows application a
"fresh bank" of EMS page frames are banked in and the application is loaded
into those page frames. If you click back to the previous application then
windows will switch to that applications bank. It's useful for running
multiple windows applications at the same time but each application must
be able to "run" in the standard 640K environment (Slightly more because
some of the memory above 640K can be used). Basically what EMS buys 
you is the ability to load MULTIPLE applications and NOT larger applications.
An article by Paul Yao in the January 1988 issue of MicroSoft Systems
Journal describes it much better.
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UUCP: {ames,sun,apple,mtxinu,cae780,sco}!excelan!gerry  Gerry Reynolds
BARRNet: gerry@excelan.com 
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