Booty: Routine at D5CF

D5CF: Menu Keypress

Used by the routine at TitleScreen.
Use FRAMES as a timer.
MenuKeypress	D5CF	LD BC,$0000	Reset *FRAMES to 0000.
	D5D2	LD ($5C78),BC	Reset *FRAMES to 0000.
This entry point is used by the routine at ToggleMusic.
MenuKeypress_Loop	D5D6	LD BC,($5C78)	BC=*FRAMES.
	D5DA	LD A,B	Jump to DemoMode if the timer held by FRAMES is up.
	D5DB	CP $04
	D5DD	JP Z,DemoMode
	D5E0	CALL SmallPause	Call SmallPause (presumably to debounce).
Fetch the players pressed key (if any) and handle it. No keys being pressed returns a FF response.
	D5E3	CALL $028E	Call KEY_SCAN.
	D5E6	LD A,E	Jump to ToggleMusic if the fire button has been pressed.
	D5E7	CP $10
	D5E9	JP Z,ToggleMusic
	D5EC	CP $FF	Return if any button has been pressed.
	D5EE	RET NZ	Return if any button has been pressed.
	D5EF	LD A,($5BEA)	Jump to MenuKeypress_Kempston if *ControlMethod is set to Kempston joystick (0C).
	D5F2	CP $0C
	D5F4	JP Z,MenuKeypress_Kempston
	D5F7	JR MenuKeypress_Loop	Jump to MenuKeypress_Loop.
Handle checking if the player has pressed fire on their Kempston joystick.
MenuKeypress_Kempston	D5F9	IN A,($1F)	Read from the Kempston joystick port.
	D5FB	AND %00010000	Jump to MenuKeypress_Loop if fire has not been pressed.
	D5FD	JR Z,MenuKeypress_Loop	Jump to MenuKeypress_Loop if fire has not been pressed.
	D5FF	LD A,$23	A=23.
	D601	RET	Return.