IBM 2274 manual Parallel Port Signals, Mouse Port Signals, Keyboard Port Signals

Parallel Port Signals

Pin	Signal	I/O	Pin	Signal	I/O
	Name			Name
1	Strobe	O	14	Auto Feed	N/A
2	Data Bit 0	I/O	15	Error	I
3	Data Bit 1	I/O	16	Initialize	O
4	Data Bit 2	I/O	17	Select (In)	O
5	Data Bit 3	I/O	18	Ground	P
6	Data Bit 4	I/O	19	Ground	Power
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	0	--	--	--
Mouse Port Signals

Pin	Signal	I/O	Pin	Signal	I/O
	Name			Name
1	Mouse	I/O	4	+5 V dc	Power
	Data
2	No	--	5	Mouse	I/O
	Connection			Clock
3	Ground	Power	6	No	--
				Connection
Keyboard Port Signals

Pin	Signal	I/O	Pin	Signal	I/O
	Name			Name
1	Data	I/O	4	+5 V dc	Power
2	No		5	Clock	I/O
	Connection
3	Ground	Power	6	No	--
				Connection

128 IBM Desktop System HMM