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The Original Shareware 1.1
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The Original Shareware (WeMake CDs)(Volume 1.1)(CDs, Inc)(1993).iso
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DIRECTLY.TEC
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1990-07-03
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ID:WS Writing Directly to the Screen
How can I tell if my program writes directly to the screen?
Or how much memory it needs?
-----------------------------------------------------------
To tell if an application is writing directly to the video
hardware inside DESQview, make the following changes in the
application's Change a Program menu:
1) Set "Writes Text Directly to Screen" to N;
2) Set "Virtualize Text/Graphics" to N;
3) On the Advanced Options screen, blank out the following four
fields in the "Window Position" section: Starting Height,
Starting Width, Starting Row, and Starting Column. Put blanks in
these fields, not zeros.
When these changes have been made, open the program. DESQview
will place a small window border on the screen; if the program
comes up and stays within the small window border, it does not
write directly to the screen. If it blows away the window border
and takes the full screen, it writes directly to the hardware.
There is no foolproof way to determine how much memory an
application needs to run other than trial and error. You can
make a reasonable guess by adding together the size of the .COM
or .EXE file that starts the program and the size of its biggest
overlay, but the program's data storage needs are difficult to
predict. The time-honored method for determining the correct
memory size for a window is to start by giving the window
an excessive amount of memory, then reducing that figure a bit at
a time until the program starts malfunctioning.