Epson ES-300C User Manual page 16

2. Locate jumper J1 on the card. (Ignore the J2 jumper.)
J1
A jumper's setting is determined by where the jumper is placed
on the pins. It connects either the left pin and the middle
pin or the right pin and the middle pin, as shown below.
1-4 Installing the interface Card
LPT1
LPT2