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DGRAV.DOC
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1993-08-16
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DGRAV.EXE was programmed by Jeff Cummings
This program requires VGA monitor, capable of displaying 16 colors in
the 640x480 format. OR an EGA monitor capable of displaying 640x350 in the
16-color mode.
DGRAV.EXE is a program that allows you to see the effects that gravity
has on a body in space. This program has just one body floating amidst as
many planets as you choose (up to 20). Don't worry if it goes flying off
into space, if it goes fast enough, it will start over with a new body, at
another random location on the screen. Specify the number of plantes for
it to maneuver around, by typing DGRAV n where n is the number of planets.
With this program you can restart the body at any given time, by
pressing the SPACE bar. And you can view in numerical format where the body
is at any time, by pressing the RETURN key. Any other key will end the
program instantly. If you wish to alter the path of the object moving
between planets, you must turn the NUM LOCK to ON, and use the numeric
keypad to alter the direction, all NINE directions will work (5=stop).
The way the saving works is this: First it saves to the name GRAVSAVA
and then it saves to GRAVSAVB, etc. So you have about 26 saves, then you
should stop and rename them, I did that, so you don't have to stop the
program to save the display, just hit S or s and it just flickers for a
moment, and it continues it's display. Also hit L or l to load a file,
I have included NEG4 as something interesting, one of the planets actually
has negative gravity!! Anyways, it makes a very interesting display. ENJOY!
AND I am also going to start to work with 256 colors very soon, so
look for that soon.
Send to: Jeff Cummings
209 W. Marion St
Aberdeen, WA 98520
And REMEMBER: Send your comments!! :-) This program is free, because
I don't care about money!! May God bless you as you watch his gravity at
work. Please ask me about some of my other programs when you write me a
comment, I would love to hear from some people. Thank you.