Battlefield - James Thurlby (ZX Computing-Apr/May 84)





Fancy your chances as a tank commander?

James Thurlby of Farnborough lets you try!



"Message from HQ to Tank Commander. Destroy enemy

sites. Return to base ... Warning ... Fields contain mines,

traps and craters ... You have 5 Tanks ... Good Luck.

	If you manage to complete your mission then you get your

just reward - another mission with even more obstacles to

avoid, and a greater concentration of enemy sites!

	To wipe out an enemy site all you have to do is to drive your

tank over it: simple but effective! Once all the sites have been

destroyed then you will be told to return to your base camp. At

the end of the game you will be given a ranking according to

your performance.

	This is one of those simple but annoyingly addictive games

which appear now and then. Controlling your tank is not as

easy as it looks and accurate timing of key presses is essential.

	Your computer controlled tank responds to key "q" to go

up, "z" down, "7" left and "8" right.  However,  it only

recognises lower case letters so make sure that CAPS LOCK is

off or, as an exercise, adjust the program to take this into account.



Variables

s$(21,31)       Character array holding screen display

tank            Number of tanks left

dest            Number of enemy sites destroyed

stage           Stage of the game

x,y             Random numbers used to calculate position of obstacles

ts              Tank UDG different for each of the four directions

a,b             Horizontal and vertical position of tank

a1 ,b1          Old tank position

res             Number of enemy destroyed in this stage

n$              Tank direction of movement

m$              Change of direction on key pressed

f               Loop variable

r$              Rank achieved by player

c,d             Duration and pitch values for BEEPs

z$              Input string for questions asked in the program



Down the lines

100-127         Initialisation routines

130-200         Main program loop

1005-1990       Move tank routine

2000-2990       Checks

3000-3140       Tank destroyed end routine

4000-4060       Stage completed routine

7900-7930       Screen coordinates

7940-8230       Initialisation of all variables, etc.

9000-9190       Instructions and UDG setup



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TYPE: Arcade Game 



Comment:



This info file was typed by Jim Grimwood



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