Routines

Address	Description
66F7	Convert Screen Address To Attribute Buffer Address
6704	Convert Attribute Address To Screen Buffer Address
670E	Generate Random Number
6720	Clear Screen
672E	Clear Play-Area
676F	Print String
67A9	Print Score
67B6	Handler: Score
67F6	Print Header
681C	Print Lives
6845	Handler: 2x2 Mask
684E	Handler: Eggsplosion Left
6853	Handler: Eggsplosion Right
6856	Handler: Eggsplosion
6890	Difficulty Delay?
68A1	Print Asterisk
68B8	Transition Effect
6926	Handler: Ship Explosion
696A	Draw Alien Mothership
6A23	Handler: Mothership
6B31	Fill Screen With UDG
6B4F	Print Control Menu
6B99	Print Instructions Menu
6C9D	Check Collision
6CC9	Draw Ship
6CEE	Handler: Player Death/ Game Over
6DCF	Handler: Shield
6EF8	Handler: Ship Movement
6F43	Handler: Move Ship Left
6F93	Handler: Update Ship Attributes
6FDD	Handler: Move Ship Right
7030	Handler: Player Bullets
7159	Handler: Bullet Collision
71BE	Handler: Bullet Collision Effects
7254	Handler: Level Reset
72C9	Handler: Level Complete
730D	Handler: Display Mothership Bonus
7407	New Level Check
740C	Initialise Level
74A4	Game Intro
7564	Clear Sprite Area
7599	Game Entry Point
75AD	Handler: Bird Alien
75B7	Handler: Pheenix
7616	Handler: Aliens Movement/ Spawning
79B2	Handler: Alien Explosions
7B67	Handler: Aliens
7C82	Title Screen
7DD9	Start Game
7E47	Input: "S" To Start