Routines
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7DD9: Start Game
Used by the routine at TitleScreen.
First collect the control method.
StartGame 7DD9 CALL Print_ControlMenu Call Print_ControlMenu.
This is a game the player started, so disable the demo mode and unset the game-over flag.
7DDC XOR A Write 00 to;
7DDD LD ($66F5),A
7DE0 LD ($66F3),A
7DE3 INC A Write 01 to *Flag_ExtraLife.
7DE4 LD ($66EF),A
7DE7 LD A,$04 Write 04 to *Phase.
7DE9 LD ($66F1),A
Set the players starting life count.
7DEC INC A Write 05 to *Player_Lives.
7DED LD ($66F0),A
7DF0 CALL InitialiseLevel Call InitialiseLevel.
Game_Loop 7DF3 CALL Handler_PlayerDeathGameOver Call Handler_PlayerDeathGameOver.
7DF6 CALL Handler_AliensMovement_Spawning Call Handler_AliensMovement_Spawning.
7DF9 CALL Handler_Aliens Call Handler_Aliens.
7DFC CALL Handler_AlienExplosions Call Handler_AlienExplosions.
7DFF CALL Handler_LevelReset Call Handler_LevelReset.
7E02 CALL DifficultyDelay Call DifficultyDelay.
7E05 LD A,($66F5) Jump back to Game_Loop unless *Flag_GameOver is active.
7E08 OR A
7E09 JR Z,Game_Loop
*Flag_GameOver is active, start the "Game Over" process.
7E0B LD D,$08 D=08.
StartGame_0 7E0D LD BC,$0000 BC=0000.
StartGame_1 7E10 DJNZ StartGame_1 Decrease counter by one and loop back to StartGame_1 until counter is zero.
7E12 DEC C Decrease C by one.
7E13 JR NZ,StartGame_1 Jump to StartGame_1 until C is zero.
7E15 DEC D Decrease D by one.
7E16 JR NZ,StartGame_0 Jump to StartGame_0 if D is not equal to A.
7E18 LD HL,$6514 HL=Messaging_Score.
7E1B LD DE,$651F DE=Messaging_HighScore.
7E1E LD B,$06 B=06.
7E20 PUSH HL Stash HL and DE on the stack.
7E21 PUSH DE
StartGame_2 7E22 LD A,(DE) Jump to StartGame_3 if *DE is equal to *HL.
7E23 CP (HL)
7E24 JR Z,StartGame_3
7E26 JR C,StartGame_5 Jump to StartGame_5 if *DE is less than *HL.
7E28 JR StartGame_4 Jump to StartGame_4.
StartGame_3 7E2A INC DE Increment DE by one.
7E2B INC HL Increment HL by one.
7E2C DJNZ StartGame_2 Decrease counter by one and loop back to StartGame_2 until counter is zero.
StartGame_4 7E2E POP DE Restore DE from the stack.
7E2F JR StartGame_6 Jump to StartGame_6.
StartGame_5 7E31 POP DE Restore DE and HL from the stack.
7E32 POP HL
7E33 PUSH HL Stash HL on the stack.
7E34 LD BC,$0006 BC=0006.
7E37 LDIR LDIR.
StartGame_6 7E39 POP HL Restore HL from the stack.
7E3A LD DE,$6515 DE=6515.
7E3D LD (HL),$30 Write ASCII 30 ("0") to *HL.
7E3F LD BC,$0005 BC=0005.
7E42 LDIR LDIR.
7E44 JP TitleScreen Jump to TitleScreen.
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