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Appendix for Explosiv 2.10 (cont)
Commonly Asked Questions About
Explosiv 2.10 for DOS
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 every possible display, etc., this uses about
28K. 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".