Lunar Lander Game For the HP48gII/49 series/50g Calculators AND UCalc 
=====================================================================

Lunar Lander (LLANDER) is a game written in User-RPL FOR
the HP48gII/HP49 series/HP50g calculators as well as FOR the UCalc
User-RPL Programmer.

About the Game
==============

You are in control of a lunar lander about to land on the
moon surface.  The goal is to land on the moon without first
crashing onto it.  You are given a fixed amount of fuel to
burn.  Burning fuel will slow your decend, otherwise the
law of gravity will surely bring your aircraft down in no
time.  However, you must burn your fuel sparingly.  Otherwise,
you'll run out of fuel AND you'll be free falling to your doom!
You enter the amount of fuel by pressing the amount on the 
numeric keys when the gauge is flashing.  If you don't enter
any KEY press, a fuel of 0 unit is entered, meaning you did NOT
use any fuel FOR that time.  The game continues UNTIL either
you land successfully on the moon, OR your crash into the ground.

Installation/Running LLANDER
============================

Unzip the zip file AND extract all files into a PC directory of
your choice.  LLANDER can be run on the HP calculator, OR the
UCalc User-RPL simulator.

To run LLANDER on your HP calculator
====================================
1.  Transfer the program variable named 'LLANDER' to any directory
    on your HP calculator
2.  Press the 'LLANDER' menu KEY to play.


To run LLANDER using UCalc User-RPL simulator on the PC
=======================================================

1.  Run UCalc.  UCalc is availabe from this web site.
2.  Select Tools | Project Manager from the menu
3. Click on the "Add Project..." button
4.  Select the file 'llander50g.hp2' from the files you extracted from
    the zip file.
5. Click on the "Close" button to close the Project Manager. LLANDER
    should THEN be added to UCalc to execute.
6. Click on "LLANDER" program variable on the LLANDER directORy PATH
    to select.
7. Click on the Run button to play.


Game Information
================
@   -  When variable is evaluated, game is in demo mode
@   -  To start a new game,  press 'A'
@   -  To exit the variable execution (end the game), press 'F'
@   -  You are to land your space ship on the moon's surface without crashing by burning fuel to counter the lunar
@        gravitational force.  The trick is to burn fuel at the right time and the right amount such that you don't wait
@        too long to use your fuel that by the time you use it, it's too late; and that you don't use up all your fuel 
@        prematurely before reaching the surface.  Once the game is started, the space ship will start descending 
@        toward the surface.  It's downward speed will keep increasing due to gravity unless you input units of fuel
@        to burn to counter the downward speed.  When the input fuel box is flashing, you can key in the amount of fuel to
@        burn.  You can skip the input by not keying in the amount (a zero is indicated).  This process will repeat
@        until you are safely on the ground, or your space ship is crashed.  The starting velocity is -50 (downward)
@        and at a height of 500.
@   -  Game Display:
@        The "V: " shows the current velocity of your space ship
@        The "D: " shows the distance from the ground
@        The fuel gauge shows the units of fuel remaining (you have 120 units to start each game)
@
                     
                         Copyright 2013 Stanley H.H. Lui
