IBM EasyCoder 3400e - Manual (Page 101)

HelvC NugFont
C 39
Specifications
A-7
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.