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QUESTION.DOC
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1993-11-27
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The following is a list of commonly asked questions about the
explosiv screen saver :
Q. How much memory does explosiv use as a screen saver?
A. Both versions of explosiv make every effort to use as little
memory and as few resources as possible. In the case of explosiv
for DOS the memory usage depends a great deal on how many features
you wish to have. As a simple screen blanker explosiv uses
about 1K while if you load fireworks with font saving explosiv
uses about 16K. Explosiv can be configured such that
only the display you've requested is loaded for the monitor you
have ( thus minimizing its usage of memory ).
Q. When explosiv for DOS starts the program underneath is completely
stopped. Can this be fixed?
A. No. DOS is a single tasking operating system. This means that only
one program can be run at a time. So explosiv can run the animation
routines only if it stops the currently executing program. The
"blank" display works differently since all it does is turn the screen
off. It can then let the underlying program continue while it is
waiting for a key press.
Q. Explosiv occasionally blanks the screen even if I'm in text mode.
Why doesn't it run the animated display instead?
A. When explosiv has been inactive the specified time interval it runs
a series of tests to determine whether or not it will be able to
correctly save and restore the state. It will blank the screen if
it decides that it won't be able to restore the state perfectly.
This ensures that the screen saver will, hopefully, never disturb
any aspect of the original display.
Of course, explosiv cannot restore every state. There are certain
hardware limitations that just cannot be overcome. For instance,
you will find that on your EGA the border color may not be restored
correctly. There is no way for explosiv to read the border color
and it must assume that it is black.
If you wish to disable blanking, turn the animated display off
or simply disable the screen saver you may use the "+on", "-on"
and "off" switches, respectively. These switches are provided
so that in rare case that explosiv does not select the proper
screen saving mode you may manually override it. Hopefully,
you will never find a program in which this is necessary.
Q. How do I get explosiv to work properly with my Hercules graphics
card?
A. The hercules graphics card has some very different characteristics
from other cards. In particular, there is no reliable way to
detect whether you are in text mode or graphics mode. So
explosiv, once active, does not know whether it should restore
the screen to text mode or to graphics mode. To further
complicate things there are two possible graphics modes ( more
specifically, graphics pages ) that the card can be in.
However, explosiv provides switches that allow you to manually
tell explosiv into which mode it should restore the screen.
To restore the screen to text mode ( which is the default )
use the "on" switch. To restore the screen to graphics mode
use either "+on" or "-on". To disable the screen saver use
the "off" switch.
For example, if you have a program that runs in graphics mode
you need to write a small batch file with the lines
@echo off
explosiv +on
graphics program
explosiv on
Run the batch file and see if explosiv properly restores the
screen. If it does not work replace the "+on" with "-on" and
try again. If this does not work then explosiv must be
disabled while you are running this program. You may do this
by replacing "-on" with "off".