Epson 4000 - Manual (Page 61)

3. As you pull away the tabs, the SIMM falls to the side.
Remove it from the socket.
4. If necessary, follow the same procedure to remove the other
SIMM.
5. If you are inserting different SIMMs, follow the instructions
on page 4-11 to install your new SIMMs.
6. Replace any option cards you removed, as described below.
installing an Option Card
This section explains how to install option cards in your computer.
Your computer has three 16-bit, full-length slots and two 8-bit,
half-length slots to accommodate a total of five option cards.
Usually it does not matter which slot an option card occupies as
long as the card fits in the slot. For example, you can place
some 8-bit cards in a 16-bit slot. However, you cannot install a
16-bit card in an 8-bit slot.
4-14 Installing and Removing Options