This program has been released into the
public domain by Martin Brownlow.
You are free to distribute this program
so long as all the files listed below
are kept with it, and no charge is made
other than a small fee to cover costs
(max 3 UK pounds).
GRAV.PRG
GRAV.DOC
LEVELS.DAT
WARNING:
Do not run this program on a machine
running faster than 8Mhz. The screen
update routine used was written for
speed, and any machine going too fast
would make the screen update faster than
50Hz and therefore render the game
unplayable.
GRAV
By Martin Brownlow
Introduction
In a strange and bizarre set of out
of date dimensions, there existed a be-
ing which was totally evil.
It had already conquered all of the
galaxies and star systems in it's own
dimension, and also in two others, and
it was hungry for more. Then it found
it's way into our dimension.
It had taken over two of our bases
before we even knew it was there, corr-
upting the men that lived there so they
would serve it. Now it is trying for
the Earth.
You have been chosen to attack it's
two bases, and then hopefully destroy
it forever. Your ship is the best that
Earth's scientist's could produce and
can teleport into the very heart of a
base.
GOOD LUCK.
The Game
Grav is a 'rotate and thrust' game,
similar in concept to Thrust and Oids.
To complete a level, simply follow the
instructions in the mission briefing.
To complete most levels,you simply need
to destroy all enemy installations.
There are eleven levels in all, three
are training levels,and the two planets
are four levels each. You can attempt
the planets in any order, but you must
complete both planets to win.
The Options
When you have chosen which set of
levels to play, you are presented with
a menu with four entries, the first of
which is INTELLIGENCE. Choosing this
will take you to a description of some
of the most common installations.
MISSION BRIEFING does exactly what it
suggests, as does COMMENCE MISSION. The
final option is REVIEW CRAFT. This
allows you to alter the craft's charac-
teristics to suit your taste, and also
add shields and so on.
The things you can alter are:-
IMPACT SHIELDS (1 resource point)
protects your ship from 1 bullet hit.
SHOT POWER (5 resource points)
upgrades your bullet strength.
VANE STRENGTH (2 resource points)
allows faster landings.
ENGINE THRUST (0 resource points)
allows you to alter the strength of
your ship's thrusters.
TURN RATE (0 resource points)
alters the speed of rotation of your
ship.
Controls
LEFT rotate anticlockwise
RIGHT rotate clockwise
UP thrust
DOWN activate teleport beacon
FIRE fire bullet (continuous)
SPACEBAR fires a bomb.