Epson 3865X Plus - Manual (Page 117)

Installing an Option Card
Your computer has four standard option slots: three 16-bit
access slots and one 8-bit access slot. Each slot can
accommodate an option card. You can buy option cards from
authorized Epson dealers as well as other vendors.
This section explains how to install option cards in your
computer. Later on, you may need to remove an option card to
access jumpers, memory modules, or a math coprocessor. If so,
see “Removing an Option Card,” on page 5-16, for instructions.
5-10 Installing and Removing Options