Epson 486SX - Manual (Page 26)

3. One end of the printer cable has a 25-pin, D-shell connector.
Position the plug to match the orientation of the parallel
port (marked with a special icon); then insert it into the
port, as shown below. If the plug has retaining screws, be
sure to tighten them.
4. Connect the other end of the cable to the printer, as shown
below. To secure the cable, squeeze the clips at each side of
the printer port.
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Setting Up Your System