Epson EQUITY 3865X/20 PLUS User Manual page 133

The sockets are labelled as shown below.
U16 U17 U20 U21
3. If an option card is blocking access to the SIMM sockets,
follow the steps on page 6-9 to remove the card(s).
Hold the SIMM so the component side is facing to the left
4.
and the metal connector pins are facing down.
bank 0 bank 1
components
connector pins
Installing and
U24 U25
bank 2
Removing Options
6-13