Submarine (aka. Depth Charge)

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by Brian Wilson

from ZX Computing, February/March 1984



Its a battle of wits between you and the sub commander. Can you read the

sonar correctly and depth charge the U-Boat? Thanks to Brian Wilson for this

intriguing game.





Imagine you are the Captain of a ship sailing the ocean, tracking down an

enemy submarine. Your task is to hunt and destroy the sub, which is not easy,

considering that you can't see it! Help at least is at hand in the form of

sonar - the delay and pitch of the returning echo is all the information you

have, though. And armed with this information you must determine where you

think the submarine is, set the depth charge and launch it.



Attention all shipping!



Now you didn't exactly expect that the submarine commander would just sit

there and wait for you to get him, did you? And believe me, he doesn't! He

will fire a torpedo at your ship. But wait. Your early warning system will

give you an audible warning - can you evade the deadly weapon?



The details



In order to save over-elaborate instructions in the program, a training

facility is built-in and if you press 0 at the start, the submarine will

appear, without being armed with torpedos and you cannot score. You need only

press any other key to get going. Press 1 for sonar, press 2 to release the

depth charge, keys 5 and 8 move your ship and keys 6 and 7 control the depth

of charge. If at any time you should get stuck, just press 9 again to make

the submarine appear.



Your points build up as you press a key and the aim is to get the lowest

number of points. Happy hunting!



Lines     Action

  40- 170 Initialising and screen build up

 300- 320 Moves ship

 350      Gives help if you go over 100

 400- 430 Sonar

 450      Initiate torpedo warning

 500- 550 Set depth charge and launch

 610- 620 Prints submarine (help)

 700- 730 Charge descends

 740- 820 Submarine destroyed

 830- 895 Score diplay

 900- 930 Charge exploding

1000-1130 Instructions

2000-2086 Graphics

3000-3090 Torpedo warning and ship sinking

