Nightshade: Routine at 55050

55050: Update Fragment

The routine for objects of type 140 to 143, the fragments that fly out of a monster that has been destroyed. A fragment moves in a straight line, and turns into a burst when it hits something.
UpdateFragment	55050	RES 1,(IX+7)	Clear the flag that shows that the fragment has been drawn.
	55054	LD A,(IX+5)	Set the velocity of the fragment from its speed and direction.
	55057	CALL SetVelocityFromSpeed
	55060	CALL TestMove	Check whether the scenery blocks the move.
	55063	CALL MoveObject	Move the fragment.
	55066	CALL NextSpriteNumber	Change the sprite of the fragment.
	55069	BIT 0,(IX+7)	Return if the fragment has not hit anything.
	55073	RET Z	Return if the fragment has not hit anything.
	55074	LD (IX+0),12	Turn the fragment into a burst and return.
	55078	RET	Turn the fragment into a burst and return.