Routines
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ABF5: Handle Alarm
The handler for the alarm (object 50) in the game over scene. Every eight frames it changes colour between black and bright yellow and beeps. After 10 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 ABF5 LD A,($5B02) Fetch FrameCounter.
ABF8 LD C,A Keep it in C.
ABF9 AND %00000111 Keep bits 0 to 2.
ABFB JR NZ,ColourCells Jump to ColourCells if this is not the eighth frame.
ABFD BIT 3,C Jump to HandleAlarm_SetColour if bit 3 of the frame counter is clear.
ABFF JR Z,HandleAlarm_SetColour
AC01 ADD A,$46 Add 46.
HandleAlarm_SetColour AC03 LD (IX+$10),A Set the colour of the alarm.
AC06 CALL PlayLowBeep Call PlayLowBeep.
AC09 INC (IX+$11) Increment the colour-change count.
AC0C LD A,(IX+$11) Jump to ColourCells unless there have been 10 changes.
AC0F CP $10
AC11 JR NZ,ColourCells
AC13 LD A,$01 Write 01 to GameOverSceneStage.
AC15 LD ($5B41),A
AC18 LD (IX+$00),A Set the sprite number to 01.
AC1B CALL ColourCells Call ColourCells.
AC1E JP SetWipeAndDrawFlags Jump to SetWipeAndDrawFlags.
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