"Saucer Battle"
By John Hurst
ARCADIAN 2 no. 1 (November 29, 1979): 1-2.
ARCADIAN 2 no. 5 (March 24, 1980): 39.


From the "Arcadian" newsletter:

                                Saucer Battle 

                                By John Hurst

                                    9/79

  10 -  100   Initialize and Input mode of play.  Draw stars and print scoring.
 200 -  290   Draw saucers and allow control by hand controls. Two player game.
 300 -  495   One player against computer.  Draw saucers, left for player,
              right for computer.  Computer random positioning and movement.
              Set ups for computer or TR(1) firing.
  500 - 530   Set ups for TR(1) or TR(2) firing in two player mode.
        540   Back to two player program if neither saucer fires LASER.
 600 -  680   Fire left saucer's LASER, if a hit goto blowup routine, if not
              go back to one or two player routine, whichever is in use.
 700 -  780   Same as 600, but for right saucer.
 800 -  860   Blowup right saucer, back to main program in use. Upgrade score.
 900 -  960   Blowup left saucer, back to main program in use.  Upgrade score.
1000 - 1010   Print GAME OVER.  If GO key is pressed, goto line 10 to
              play again.


This game can be played by two or one, (against the computer).  Difficulty of 
hitting target can be selected, 0 to 1, 0 being the hardest.

Amount of LASER blasts and Max Score to win can be selected.

If one player option is selected, accuracy of the computer can be set, 0 to 2, 
0 being the most accurate.  If the computer fires when accuracy is 0, it will 
not miss.

If both triggers are pulled at the same time, neither will fire, in two player 
option.

If remaining LASER blasts are five or less, an open hole will appear in the 
center of the saucer that is low on charge.  When all charge for LASER is 
depleted for one saucer, he can no longer fire.

If both saucers are depleted of charge, or Max Score is reached by one saucer, 
game is over.  To play again just press GO key.

The memory use of this game is very close to the max available to the Bally, so 
care should be used when entering this program.  Use no spaces unless 
necessary, the listing may have extra spaces due to my typing.  If you don't 
need them, don't use them.  Also deleting lines 1-5 can save some memory if 
needed.

Good Luck.

John R. Hurst