Routines
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24327: Game Initialisation
Clears the game variables, builds the day time game window and then runs the game selection menu until the player chooses to start a game.
Blank the game variables.
GameInitialisation 24327 LD HL,24064 Write 0 to the 164 bytes from 24064 to 24227.
24330 LD DE,24065
24333 LD BC,163
24336 LD (HL),0
24338 LDIR
24340 LD HL,65535 Write 65535 to BestTime_1 (the best time) - this isn't used anywhere until Flag_BestTime is set.
24343 LD (24064),HL
This entry point is used by the routine at GameOver.
Entered again when a game is over, to return to the game selection menu.
Game_Restart 24346 LD HL,65535 Write 65535 to PlayerWorldPosition.
24349 LD (24116),HL
24352 LD SP,24064 Set the stack pointer to 24064.
24355 CALL SetDayAttributes Set the day time attributes using SetDayAttributes.
24358 CALL CreateWindow Create the game window using CreateWindow.
Print the menu, then check the keyboard for the player's choice.
GameSelect_Loop 24361 CALL GameMenu Print the game selection menu using GameMenu.
The "Best Time Today" banner only shows when one is set. The flag at Flag_BestTime toggles it on/ off.
24364 LD A,(24067) If Flag_BestTime is not zero, call DisplayBestTime.
24367 AND A
24368 CALL NZ,DisplayBestTime
24371 LD A,(24126) Take a copy of the control options from GameOptions.
24374 LD D,A
24375 LD A,247 Read from the keyboard;
Port Number Bit
0 1 2 3 4
247 1 2 3 4 5
24377 OUT (253),A
24379 IN A,(254)
24381 CPL Flip the bits, so a pressed key is now a set bit.
Handle keyboard selection.
GameSelect_CheckKeyboard 24382 BIT 0,A Jump to GameSelect_CheckJoystick if key "1" has not been pressed ("1 KEYBOARD").
24384 JR Z,GameSelect_CheckJoystick
24386 RES 1,D Reset bit 1 of the options in D, to select the keyboard.
Handle joystick selection.
GameSelect_CheckJoystick 24388 BIT 1,A Jump to GameSelect_CheckStart if key "2" has not been pressed ("2 JOYSTICK").
24390 JR Z,GameSelect_CheckStart
24392 SET 1,D Set bit 1 of the options in D, to select the joystick.
Handle starting a new game.
GameSelect_CheckStart 24394 BIT 2,A Jump to StartGame if key "3" has been pressed ("3 START GAME").
24396 JP NZ,StartGame
Store the choice, then flash the selected menu line.
24399 LD A,D Save the control options back to GameOptions.
24400 LD (24126),A
24403 LD HL,24488 Point HL at the colour of the first selectable menu line (GameSelection_Attributes_Options), which skips the title.
24406 LD A,(24126) Fetch the control options from GameOptions into C.
24409 LD C,A
24410 BIT 1,C If the joystick option is selected, jump to MenuAttributeSetSecond.
24412 JR NZ,MenuAttributeSetSecond
Set the first menu item, unset the second.
MenuAttributeSetFirst 24414 SET 7,(HL) Set the FLASH attribute for the first selection.
24416 INC HL Move on to the colour of the second menu line.
24417 RES 7,(HL) Unset the FLASH attribute for the second selection.
24419 JR GameSelect_Loop Jump to GameSelect_Loop.
Unset the first menu item, set the second.
MenuAttributeSetSecond 24421 RES 7,(HL) Unset the FLASH attribute for the first selection.
24423 INC HL Move onto the next menu attribute.
24424 SET 7,(HL) Set the FLASH attribute for the second selection.
24426 JR GameSelect_Loop Jump to GameSelect_Loop.
View the equivalent code in;
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