IBM 2169 manual Mouse Port Signals Pin Signal Name, Keyboard Port Signals Pin Signal Name

7	Data Bit 5	I/O	20		Ground		Power
8	Data Bit 6	I/O	21		Ground		Power
9	Data Bit 7	I/O	22		Ground		Power
10	Acknowledge	I	23		Ground		Power
11	Busy	I	24		Ground		Power
12	Paper Empty	I	25		Ground		Power
13	Select	O
Mouse Port Signals
Pin	Signal Name	I/O		Pin		Signal Name		I/O
1	Mouse Data	I/O		4		+5 V dc		Power
2	No Connection	N/A		5		Mouse Clock		I/O
3	Ground	Power		6		No Connection		N/A
Keyboard Port Signals
Pin	Signal Name	I/O		Pin		Signal Name		I/O
1	Keyboard Data	I/O		4		+5 V dc		Power
2	Mouse Data	N/A		5		Keyboard Clock		I/O
3	Ground	Power		6		Mouse Clock		N/A

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