Trashman: Routine at 42613

42613: Game Selection Menu

Used by the routine at GameEntryPoint.

Prints "Please select method of control".

GameMenu 42613 LD HL,43915 HL=Messaging_SelectControl.

42616 LD DE,18464 DE=18464 (screen buffer location).

42619 CALL PrintString Call PrintString.

Prints "1 : Keyboard ( cursor keys )".

42622 LD HL,43947 HL=Messaging_SelectKeyboard.

42625 LD DE,18529 DE=18529 (screen buffer location).

42628 CALL PrintString Call PrintString.

Prints "2 : Kempston joystick".

42631 LD HL,43976 HL=Messaging_SelectKempston.

42634 LD DE,18561 DE=18561 (screen buffer location).

42637 CALL PrintString Call PrintString.

Prints "3 : Interface 2".

42640 LD HL,43998 HL=Messaging_SelectInterface2.

42643 LD DE,18593 DE=18593 (screen buffer location).

42646 CALL PrintString Call PrintString.

Prints "4 : Cursor key type joysticks".

42649 LD HL,44014 HL=Messaging_SelectCursor.

42652 LD DE,18625 DE=18625 (screen buffer location).

42655 CALL PrintString Call PrintString.

Handle retrieving the players input.

42658

LD BC,63486

Read from the keyboard;

Port Number	Bit
Port Number	0	1	2	3	4
247	1	2	3	4	5

GameMenu_Loop 42661 IN A,(C)

42663 BIT 0,A If "1" is pressed, set HL to Handler_Controls_Keyboard and jump to GameMenu_WriteControl.

42665 LD HL,46783

42668 JR Z,GameMenu_WriteControl

42670 BIT 3,A If "4" is pressed jump to GameMenu_WriteControl.

42672 JR Z,GameMenu_WriteControl

42674 LD HL,46821 If "2" is pressed, set HL to Handler_Controls_Kempston and jump to GameMenu_WriteControl.

42677 BIT 1,A

42679 JR Z,GameMenu_WriteControl

42681 LD HL,46851 If "3" is not pressed, set HL to Handler_Controls_Interface2 and jump to GameMenu_Loop.

42684 BIT 2,A

42686 JR NZ,GameMenu_Loop

The controller routine is written as the target address for a CALL operation at Handler_Controls.

GameMenu_WriteControl 42688 LD (46780),HL Write the appropriate controller location from HL into the CALL target at *46780.

42691 CALL PressAnyKey_0 Call PressAnyKey_0.

42694 RET Return.