Epson 486SX - Manual (Page 113)

Installing Option Cards
Follow these steps to install an option card:
1. If you are installing an option card that controls a mouse, you
need to change the setting of jumper JP7 before you install
the card. If you install a display adapter card, you may
need to change the settings of jumpers JP4 and JP6. If this is
the case, see page 6-4 for instructions.
2. Remove the retaining screw from the top of the metal option
slot cover; hold on to the screw so it doesn’t fall into the
computer. Lift out the slot cover.
Keep the screw to secure the option card to the computer. Store
the slot cover in a safe place in case you remove the option
card later.
6-10 Installing and Removing Options