Knight Lore: Routine at BD54

BD54: Store the method, then key 5: directional control

Used by the routine at check_for_interface_ii. Key 5 flips bit 3 of $5BA4, once per press: bit 0 of $5BD2 remembers that the key is down, and clr_debounce clears it when the key is let go.
check_for_directional_control	BD54	LD ($5BA4),A	the method chosen by keys 1 to 4
	BD57	LD HL,$5BD2
	BD5A	BIT 4,E	key 5 not pressed: clear the latch
	BD5C	JR Z,clr_debounce	key 5 not pressed: clear the latch
	BD5E	BIT 0,(HL)	still held since last pass: do nothing
	BD60	JR NZ,check_for_start_game	still held since last pass: do nothing
	BD62	SET 0,(HL)	new press: latch it and toggle directional control
	BD64	LD A,($5BA4)
	BD67	XOR $08
	BD69	LD ($5BA4),A