Routines
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44021: Handle Alarm
The handler for the alarm (object 80) in the game over scene. Every eight frames it changes colour between black and bright yellow and beeps. After 16 changes it retires itself and starts the attacks on the robot by setting GameOverSceneStage.
Input
IX The address of the object
Flash the alarm every eight frames.
HandleAlarm 44021 LD A,(23298) Fetch FrameCounter.
44024 LD C,A Keep it in C.
44025 AND %00000111 Keep bits 0 to 2.
44027 JR NZ,ColourCells Jump to ColourCells if this is not the eighth frame.
44029 BIT 3,C Jump to HandleAlarm_SetColour if bit 3 of the frame counter is clear.
44031 JR Z,HandleAlarm_SetColour
44033 ADD A,70 Add 70.
HandleAlarm_SetColour 44035 LD (IX+16),A Set the colour of the alarm.
44038 CALL PlayLowBeep Call PlayLowBeep.
44041 INC (IX+17) Increment the colour-change count.
44044 LD A,(IX+17) Jump to ColourCells unless there have been 16 changes.
44047 CP 16
44049 JR NZ,ColourCells
44051 LD A,1 Write 1 to GameOverSceneStage.
44053 LD (23361),A
44056 LD (IX+0),A Set the sprite number to 1.
44059 CALL ColourCells Call ColourCells.
44062 JP SetWipeAndDrawFlags Jump to SetWipeAndDrawFlags.
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