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Pins 14, 15, 34 and 35 are not used, while pins 16, 17, 19-30
and 33 are grounded. Pin 18 is connected to the +5VDC supply
in the printer.
Pin 31 can be used to reset the printer. If this signal (RESET)
goes low the printer will reinitialize. Pin 32 is used to report
error conditions in the printer. This signal (ERROR) is high
during normal operation and goes low to report that the printer
cannot print due to an error condition.