Xerox P12 manual Port A Parallel Pin Configuration, Signal Name

B		Pin Configuration
	The signal name for each pin is listed in the following table.
		Port A Parallel Pin Configuration
	Pin	Signal Name	Pin	Signal Name
	1	STROBE (input)	19	GND
	2	DATA 1 (Input)	20	GND
	3	DATA 2 (Input)	21	GND
	4	DATA 3 (Input)	22	GND
	5	DATA 4 (Input)	23	GND
	6	DATA 5 (Input)	24	GND
	7	DATA 6 (Input)	25	GND
	8	DATA 7 (Input)	26	GND
	9	DATA 8 (Input)	27	GND
	10	ACK (Output) active low	28	GND
	11	BUSY (Output)	29	GND
	12	Paper Error (Output)	30	GND
	13	Select (output)	31	INIT
				active low
	14	Auto Feed (Input)	32	Fault (Output)
				active low
	15	Not Connected	33	Not Connected
	16	Not Connected	34	Not Connected
	17	Not Connected	35	Not Connected
	18	Peripheral Logic High	36	Selln (Input) active low

DATA 1 to DATA 8 These eight high-true signals are used to transfer data from the user’s system to the printer.

ACK This low-true signal from the printer informs your system that a data byte has been received.

BUSY This high-true signal from the printer indicates that it is busy and cannot receive data. When it is low, the printer is ready to receive data.

PAPER ERROR This high-true printer output indicates a paper out condition. SELECT This high-true output indicates that the printer is selected to receive data. SELIN This signal is used for bi-directional data transfer.

FAULT This printer output, when low, indicates a printer fault condition.

164• Appendix B