Gyruss: Routine at 81AE

81AE: Switch player

Used by the routine at lose_life.
switch_player	81AE	LD A,(status_flags)	Test for two players
	81B1	BIT 7,A	...
	81B3	JR Z,switch_player_1	Skip ahead if one player
	81B5	BIT 5,(HL)	Is one player already game over?
	81B7	JR NZ,switch_player_1	Skip ahead if not set
This entry point is used by the routine at lose_life.
switch_player_0	81B9	LD HL,buffer	Restore player data from VDP RAM into buffer
	81BC	LD DE,$1300	...
	81BF	LD BC,$002D	...
	81C2	CALL $1FE2	READ_VRAM
	81C5	LD HL,lives	Save player data to VDP RAM
	81C8	LD DE,$1300	...
	81CB	LD BC,$002D	...
	81CE	RST $38	WRITE_VRAM
	81CF	LD HL,buffer	Copy data from buffer to right place
	81D2	LD DE,lives	...
	81D5	LD BC,$002D	...
	81D8	LDIR	...
	81DA	LD A,(current_player)	Current player
	81DD	XOR $01	Switch player
	81DF	LD (current_player),A	Save again
switch_player_1	81E2	CALL init_stage	Initialize stage
	81E5	LD HL,other_flags	Set flag
	81E8	SET 5,(HL)	...
	81EA	JP main_loop	To main loop