Epson EL 3S/33 - Manual (Page 57)

4.
5.
6.
7.
8.
Position one of the memory chips over the first socket as
shown below, aligning the pins on the chip with the holes
in the socket. Make sure the small notch on the end of the
chip is facing the outside of the computer.
Gently press the chip halfway into the socket (to make sure
it is correctly aligned). If the chip goes in at an angle,
remove it with a chip puller or a small flat-head
screwdriver and try again.
When the chip is properly positioned, push down firmly on
both ends of the chip to make sure it is well-seated.
Repeat steps 4 through 6 for each of the remaining chips.
Replace any option cards you removed. See page 3-13 for
instructions.
When you start your computer, it displays the video memory
briefly before it begins its memory test.
3-18 Installing and Removing Options