Knight Lore: Routine at C9CD

Used by the routine at apply_gravity.

Stores the new dZ, and keeps a copy in $5BC1: the collision code will shorten dZ, and the copy is what says afterwards which way the player was trying to go. A fall faster than two units a frame has a sound pitched by the height.

Then adj_for_out_of_bounds shortens the move against the walls and the other objects, handle_exit_screen checks for a walk out of the room (and does not come back if there is one), and add_dXYZ adds what is left to the position. A move downwards that was stopped (bit 2 of +$0C) is a landing, and ends the jump.

Used by the routine at apply_gravity. Stores the new dZ, and keeps a copy in $5BC1: the collision code will shorten dZ, and the copy is what says afterwards which way the player was trying to go. A fall faster than two units a frame has a sound pitched by the height. Then adj_for_out_of_bounds shortens the move against the walls and the other objects, handle_exit_screen checks for a walk out of the room (and does not come back if there is one), and add_dXYZ adds what is left to the position. A move downwards that was stopped (bit 2 of +$0C) is a landing, and ends the jump.
move_player_apply	C9CD	DEC A	the first unit
	C9CE	LD (IX+$0B),A	new dZ, and the intended dZ in $5BC1
	C9D1	LD ($5BC1),A
	C9D4	ADD A,$02	falling faster than 2: the falling sound
	C9D6	CALL M,sound_pitch_from_z	falling faster than 2: the falling sound
	C9D9	CALL adj_for_out_of_bounds	cut the move short where it must be
	C9DC	CALL handle_exit_screen	out of the room?
	C9DF	CALL add_dXYZ	X, Y, Z += dX, dY, dZ
	C9E2	BIT 2,(IX+$0C)	stopped while moving down?
	C9E6	JR Z,clear_dX_dY
	C9E8	LD A,($5BC1)
	C9EB	AND A
	C9EC	JP P,clear_dX_dY
	C9EF	RES 3,(IX+$0C)	then landed: the jump is over