I/O Port Map - Game Gear - Development - SMS Power!

	GG		GG (SMS Mode)
Port	Write	Read	Write	Read
0x00	Start Button	Start Button	Memory Control	0xff
0x01	Serial Port	Serial Port	I/O Port Control	0xff
0x02	Serial Direction	Serial Direction	Memory Control	0xff
0x03	Serial Tx	Serial Tx	I/O Port Control	0xff
0x04	Serial Rx	Serial Rx	Memory Control	0xff
0x05	Serial Status	Serial Status	I/O Port Control	0xff
0x06	Stereo	Stereo	Memory Control	0xff
...	...	...	...	...
even	Memory Control	0xff	Memory Control	0xff
odd	I/O Port Control	0xff	I/O Port Control	0xff
...	...	...	...	...
0x3E	Memory Control	0xff	Memory Control	0xff
0x3F	I/O Port Control	0xff	I/O Port Control	0xff
0x40	SN76489	V Counter	SN76489	V Counter
0x41	SN76489	H Counter	SN76489	H Counter
...	...	...	...	...
even	SN76489	V Counter	SN76489	V Counter
odd	SN76489	H Counter	SN76489	H Counter
...	...	...	...	...
0x7E	SN76489	V Counter	SN76489	V Counter
0x7F	SN76489	H Counter	SN76489	H Counter
0x80	VDP Data	VDP Data	VDP Data	VDP Data
0x81	VDP Control	VDP Status	VDP Control	VDP Status
...	...	...	...	...
even	VDP Data	VDP Data	VDP Data	VDP Data
odd	VDP Control	VDP Status	VDP Control	VDP Status
...	...	...	...	...
0xBE	VDP Data	VDP Data	VDP Data	VDP Data
0xBF	VDP Control	VDP Status	VDP Control	VDP Status
0xC0	N/A	Joypad 1	N/A	Joypad 1
0xC1	N/A	Joypad 2	N/A	Joypad 2
...	...	...	...	...
even	N/A	0xff	N/A	0xff
odd	N/A	0xff	N/A	0xff
...	...	...	...	...
0xDC	N/A	Joypad 1	N/A	Joypad 1
0xDD	N/A	Joypad 2	N/A	Joypad 2
...	...	...	...	...
even	N/A	0xff	N/A	0xff
odd	N/A	0xff	N/A	0xff
...	...	...	...	...
0xF0	N/A	0xff	N/A	0xff
0xF1	N/A	0xff	N/A	0xff
0xF2	N/A	0xff	N/A	0xff
...	...	...	...	...
even	N/A	0xff	N/A	0xff
odd	N/A	0xff	N/A	0xff
...	...	...	...	...

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