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DIRECTLY.TEC
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1990-08-30
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ID:WS Writing Directly to the Screen
Quarterdeck Technical Note
by Dan Sallitt
Q: 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.
Without QEMM's and QRAM's LOADHI program, there is no reliable way
to determine how much memory an application needs to run other than by
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 a 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.
With LOADHI's /GS (get size) parameter, discussed in the QEMM and
QRAM manuals, you can get an accurate estimate of how much memory
a program takes. After you finish running the program with LOADHI,
two numbers are returned: the first is how much memory the program
took to load and initialize, and the second is the amount of
memory the program permanently retained.