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- INSTRUCTIONS FOR PLAYING PEARL HARBOR
-
- Source Code is Turbo Pascal and 8086 Assembly.
-
- This is basically a game in which you are attempting to shoot down the
- Japanese carrier planes attacking the US fleet anchored in Pearl Harbor
- (Harbour) on December the 7th 1942 with an anti aircraft gun.
-
- Although it is meant as a game,it is in fact a real time simulation.
- The air speed of the planes is 150 metres/sec and that of the shells 1000 m/s.
- The shells and bombs follow correct gravitational trajectories.
- The position of all the objects which comprise up to 7 planes,
- 10 shells and 3 bombs is evaluated every 0.25 second, and the screen
- is updated every 0.5 seconds. All these objects and the scenery appear
- to move relative to the gun sight as the gun is moved. Objects appear
- as they would to a gunner staring down the sight. The program has a
- mechanism for maintaining the correct pace for those with faster PCs.
-
- As a player's score increases the frequency of planes will increase and the
- direction of the attacks will diversify. A ship is sunk if the bombs land
- within 85 metres longitudinally and 30 metres horizontally of its central
- coordinates. Planes are hit if a shell comes within 30 metres vertically,
- 65 metres horizontally and 200 metres longitudinally.
-
- As ships are sunk their coordinates are transferred to the gun implacement
- which brings the gun under increasing probability of attack.
- For every 15 planes shot down the player has the number of times out of the
- remaining targets that the gun is targeted reduced by 1. The score and the
- potential targeting of the gun are shown at the top of the screen.
-
- The game ends when the gun position is bombed out.
- The objective is to shoot down as many planes as possible.
-
- Method of play is to shoot at the planes when they appear in the gun sight
- which is always located in the centre (center) of the screen. When the
- planes are distant allow for shell trajectory, when they are near aim
- in front of of their direction of travel. The gun may be moved through
- 34 degrees either side of centre and from 5 to 45 degrees vertically.
-
- The gun is controlled either by a joystick, mouse, or from the keyboard;
- as detailed by the game on start up. In my experience the mouse gives
- the best control and the keyboard the worst. In addition to moving and
- firing the gun, pressing caps-lock will display the gun bearing and
- elevation on the screen, T will T{emporarily} stop a game and X will
- stop the game completely.
-
-
- For those using the key board a few tips:-
-
- It is better the keep the cursor keys depressed rather than to
- stab at them.
-
- Don't forget to use the Home, PgUp, End & Pg.Dn keys to move both
- axes simultaneously.
-
- The cursor keys will move the gun 1 degree, if the num lock key
- has been pressed then 3 degrees, if scroll-lock has been pressed
- then 7 degrees; if both have been pressed 9 degrees of movement
- will occur. These multiplications are cancelled by pressing the same
- key again, and these toggle keys are signalled on the top left of
- the screen.
-
- The gun fires when the Left hand shift key is held down. If you are
- moving the gun and want to begin firing release the cursor keys for
- a moment while you start to hold down the shift.
-
- As mentioned by the terminal message an enhanced version of the game can
- be obtained by sending US$15 to my wife: Virginia Dore, PO Box 70371,
- Kowloon Central Post Office, HONG KONG. M C Dore 1987.