Epson EL 486UC - Manual (Page 53)

To move a jumper from one position to the other, use
needle-nose pliers or tweezers to pull it off its pins and
gently move it to the desired position.
Caution
Be careful not to bend the jumper pins or damage any
components on the main system board.
4. Replace any option cards you removed. See page 3-14 for
instructions.
Installing Memory Modules (SIMMs)
Your computer comes with 4MB of memory on a SIMM. By
installing additional SIMMs, you can increase the amount of
memory in your computer up to 32MB.
There are two SIMM sockets on the main system board, and
each can contain one memory module. You can install lMB,
4MB, 8MB, and 16MB SIMMs. The following table shows the
possible SIMM configurations; do not install memory in any
other configuration.
SIMM configuration
3-10 Installing and Removing Options