Ant Attack: Routine at 8A5D

Used by the routine at MOVE_ANTS.

A paralysed ant does nothing. Otherwise an ant moves every frame except one in every +D: 2 is half speed, 20 very nearly full. Its explosion count goes down only on the frames it moves, so a slow ant's blast lasts twice as long. A stunned ant cannot move, so MOVE_ANT finds it no closer every frame and turns it at random: it spins where it stands (measured in a simulator). The first ant is the fast one (line 140's DATA); BASIC sets the others' speed from sp, which goes up as the levels do.

Used by the routine at MOVE_ANTS. A paralysed ant does nothing. Otherwise an ant moves every frame except one in every +D: 2 is half speed, 20 very nearly full. Its explosion count goes down only on the frames it moves, so a slow ant's blast lasts twice as long. A stunned ant cannot move, so MOVE_ANT finds it no closer every frame and turns it at random: it spins where it stands (measured in a simulator). The first ant is the fast one (line 140's DATA); BASIC sets the others' speed from sp, which goes up as the levels do.
ANT_TURN	8A5D	LD A,(IX+$06)	Paralysed.
	8A60	CP $FF
	8A62	RET Z
	8A63	CALL BLAST_FRAME
	8A66	DEC (IX+$0E)	Not the frame to skip: move.
	8A69	JR Z,ANT_TURN_0
	8A6B	CALL MOVE_ANT
	8A6E	RET
ANT_TURN_0	8A6F	LD A,(IX+$0D)	Skip it, and start counting again.
	8A72	LD (IX+$0E),A	Skip it, and start counting again.
	8A75	RET