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From: ant@batserver.cs.uq.oz (Anthony Murdock)
Newsgroups: comp.windows.ms
Subject: Re: Above EMS simulator and MS Windows
Message-ID: <2334@moondance.cs.uq.oz>
Date: 7 Dec 89 03:33:25 GMT
References: <2268@moondance.cs.uq.oz> <789@excelan.COM>
Sender: news@moondance.cs.uq.oz
Reply-To: ant@batserver.cs.uq.oz
Lines: 36

gerry@na.excelan.com (Gerry Reynolds) writes:
>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.

I tried a little experiment with windows and the "Above Disk" EMS simulator.
The experiment was to see how many applications I could run in each of the
following three situations ;
	1> Without the simulator installed,
	2> The simulator using 1.3Meg of extended as EMS, and
	3> The simulator using 4Meg of my hard disk as EMS.

The simulator takes up about 70K of main memory.  I was disappointed to find
that I was unable to load as many things into memory in situation 2 as I could
in situation 1.

In situation 3 however I could load almost as much as I could in situation 1,
much more than in situation 2.  Does this mean that I have to have something
like 8 Meg of EMS before I start seeing some benifit ?  Gerry's comments seem
to say that EMS is actually useful in ms-windows, but my results seem to say
only if you get a huge amount of it.  Am I doing something wrong ?

Please post a reply (don't email as I am moving soon) so I can work out what
is happening.

thanx in advance
ant