Samsung ML--6100 - Manual (Page 91)

6. 8 Printer Options
Serial/LocalTalk Card or Network Card
The Serial/LocalTalk option lets you connect your ML-6100 to a PC or
Macintosh serial interface, or to a Macintosh LocalTalk network.
To use the serial connection, a standard 9-pin serial cable is
required. One end has a 9-pin female connector and the other end
has a 9-pin male connector. Do not use a null-modem cable,
which is a twisted pair cable.
To use the Network I/F card, a standard RJ45 cable is required.
Review the precautions on page 6.1 and then follow this procedure
to install the Serial/LocalTalk or Network card option in your printer.
1. Turn the printer power off and disconnect the power cord and printer
cable.
2. Remove the control board cover.