Epson 10020 - Manual (Page 108)

Inserting an Option Card
Most option cards can be placed into any of the option slots.
Some cards, however, must be installed in a specific slot.
Check the option card manual to see if your option card must
go in a specific slot.
If you are installing a new video card, you must remove the
MGA card that comes installed in your computer.
Even though option cards are designed to fit only one way, it is
a good idea to examine the card first and follow the
instructions closely.
1. Decide which option slot you want to use; then remove the
retaining screw and washer from the metal cover plate at
the back of the slot. (Hold onto the screw and washer as
you remove them so that they don’t fall into the
computer.) Lift out the metal cover, as shown below.
4-4 Installing Option Cards