Epson EQUITY 386/33 PLUS - Manual (Page 71)

Installing an Option Card
Your computer has four standard option slots: three 16-bit slots
and one 8-bit 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. If you need to remove an option card later (to access
jumpers, memory modules, or a math coprocessor), see
“Removing an Option Card” on page 4-15 for instructions.
The illustration below shows the four standard option slots
inside your computer.
option card slots
Installing and Removing Options 4-11