External Connectors

Cartridge Slot

Pin	Name	Explanation
1	VDD	Power Supply +5V DC
2	PHI	System Clock
3	/WR	Write
4	/RD	Read
5	/CS	Chip Select
6-21	A0-A15	Address Lines
22-29	D0-D7	Data Lines
30	/RES	Reset signal
31	VIN	External Sound Input
32	GND	Ground

Link Port

Pin numbers are arranged as 2,4,6 in upper row, 1,3,5 in lower row; outside view of Game Boy socket; flat side of socket upside. Colors as used in most or all standard link cables, because SIN and SOUT are crossed, colors Red and Orange are exchanged at one cable end.

Pin	Name	Color	Explanation
1	VCC	-	+5V DC
2	SOUT	red	Data Out
3	SIN	orange	Data In
4	P14	-	Not used
5	SCK	green	Shift Clock
6	GND	blue	Ground

Note: The original Game Boy used larger plugs than Game Boy Pocket and newer. Linking between older/newer Game Boy systems is possible by using cables with one large and one small plug though.

Stereo Sound Connector (3.5mm, female)

Pin	Explanation
Tip	Sound Left
Middle	Sound Right
Base	Ground

External Power Supply

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