PSSST: Routine at 25423

Used by the routines at SpawnBonusItem and UpdateBonusItem.

The main game loop. The objects from State_Robbie_Active onwards are 8 bytes each, and the loop calls the update routine for the type of each object in turn (see JumpTable_Main). Every update routine returns to NewActor, which moves on to the next object.

A pass starts here with the flower object at State_Flower and carries on up to the last object (the explosion at State_Explosion), then the next pass is started here again. Whenever the frame counter has changed, FrameUpdate is called to update the first four objects (Robbie, the spray can and the two weapons) once. This means that these are updated on every frame no matter how long a pass through the other objects takes.

Used by the routines at SpawnBonusItem and UpdateBonusItem. The main game loop. The objects from State_Robbie_Active onwards are 8 bytes each, and the loop calls the update routine for the type of each object in turn (see JumpTable_Main). Every update routine returns to NewActor, which moves on to the next object. A pass starts here with the flower object at State_Flower and carries on up to the last object (the explosion at State_Explosion), then the next pass is started here again. Whenever the frame counter has changed, FrameUpdate is called to update the first four objects (Robbie, the spray can and the two weapons) once. This means that these are updated on every frame no matter how long a pass through the other objects takes.
Start a new pass through the objects.
MainLoop_NewPass	25423	LD SP,23808	SP=23808.
	25426	EI	Enable interrupts.
	25427	LD IX,24204	IX=State_Flower (the flower object).
	25431	XOR A	Write 0 to CurrentBug_ID to reset the enemy counter.
	25432	LD (24086),A	Write 0 to CurrentBug_ID to reset the enemy counter.
This entry point is used by the routines at FrameUpdate and NewActor. Check whether the frame counter has changed.
MainLoop	25435	LD A,(23672)	Compare FRAMES and LastFrame.
	25438	LD C,A
	25439	LD A,(24095)
	25442	CP C	If they are not equal call FrameUpdate to update the fast objects.
	25443	CALL NZ,FrameUpdate
Every update routine returns to NewActor.
	25446	LD HL,28976	HL=NewActor (the routine which moves onto the next object).
	25449	PUSH HL	Stash the return address on the stack.
Find the update routine for the type of the object.
	25450	LD HL,25470	HL=JumpTable_Main.
	25453	LD A,(IX+0)	A=*IX+0 (the object state).
	25456	RLCA	Rotate A left once.
	25457	AND %01111110	Keep only bits 1-6 (the object type, held in bits 0-5 of the state, multiplied by two).
PerformJump	25459	LD C,A	BC=the offset into the jump table.
	25460	LD B,0	BC=the offset into the jump table.
	25462	ADD HL,BC	HL=the address of the entry in the jump table.
	25463	LD A,(HL)	HL=the address of the update routine from the jump table.
	25464	INC HL
	25465	LD H,(HL)
	25466	LD L,A
	25467	JP IndirectJump	Jump to IndirectJump which does an indirect jump to the jump address.