Knight Lore: Routine at C00E

Used by the routine at player_controls.

Called from the player's handler with IX on the player's lower record at $5C08. One press does one thing: pick up a charm the player is on or beside if there is one; otherwise put down the oldest charm carried. $5BB3 latches the press so holding the key down does nothing more.

Nothing happens unless the player is inside the room (not in an arch), not jumping, and standing on something. It also checks whether there is an object within 12 units above the player's head; if so, $5BD3 is set and a drop is refused, because a drop lifts the player 12 units onto the dropped object.

Used by the routine at player_controls. Called from the player's handler with IX on the player's lower record at $5C08. One press does one thing: pick up a charm the player is on or beside if there is one; otherwise put down the oldest charm carried. $5BB3 latches the press so holding the key down does nothing more. Nothing happens unless the player is inside the room (not in an arch), not jumping, and standing on something. It also checks whether there is an object within 12 units above the player's head; if so, $5BD3 is set and a drop is refused, because a drop lifts the player 12 units onto the dropped object.
handle_pickup_drop	C00E	LD A,($5BB3)	still held from the last press: wait for release
	C011	AND A
	C012	JP NZ,wait_pickup_release
	C015	CALL chk_pickup_drop
	C018	RET Z
	C019	CALL chk_plyr_OOB	only inside the room's walls
	C01C	RET NC
	C01D	BIT 3,(IX+$0C)	not while jumping (+$0C bit 3), only when standing on something (bit 2)
	C021	RET NZ
	C022	BIT 2,(IX+$0C)
	C026	RET Z
	C027	XOR A	anything within 12 units above? The player's z is raised to look, then put back
	C028	LD ($5BD3),A
	C02B	LD A,(IX+$03)
	C02E	LD B,A
	C02F	ADD A,$0C
	C031	LD (IX+$03),A
	C034	CALL do_any_objs_intersect
	C037	LD (IX+$03),B
	C03A	JR NC,start_pickup_drop
	C03C	LD A,$01	yes: there is no room to stand on a dropped object
	C03E	LD ($5BD3),A