IBM EasyCoder 3400e user manual Specifications, Signal Pin Return Direction Description

				Specifications	A
	The following pin descriptions are for the printer’s parallel interface connector:
Signal	Pin	Return	Direction	Description
DATASTB	1	19	IN	Negative pulse. Latches DB0-7 on the rising edge. Eight bits
				in parallel provide data input. High is logical 1 and LOW is
				logical 0.
DB0	2	20	IN
DB1	3	21	IN
DB2	4	22	IN
DB3	5	23	IN
DB4	6	24	IN
DB5	7	25	IN
DB6	8	26	IN
DB7	9	27	IN
ACK	10	28	OUT	Negative pulse. Data has been received.
BUSY	11	29	OUT	If HIGH, printer cannot receive data.
PE	12	30	OUT	If HIGH, out of ribbon or media.
SELECT	13	-	OUT	Pulled to +5V. Printer is on.
CHASSIS GND	17	-	-	Printer's chassis gnd isolated from logic gnd.
INIT	31	16	IN	Clears I/OINT0 latch.
FAULT	32	33	OUT	See printer display.

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