Epson EQUITY 386SX/16 PLUS - Manual (Page 101)

4. If you are removing an option card that controls a
mouse, you need to change the setting of jumper J4 on
the main system board. If you are removing a display
adapter card, you may need to change the settings of
jumpers J1, J3, and J5. See page 5-7 for instructions.
5. Replace the cover. See page 5-40 for instructions.
Removing the Subassembly
You need to remove the subassembly to access the SIMM
sockets and the math coprocessor socket on your computer’s
main system board. The subassembly is the large metal casing
that holds the horizontal drive bays and the power supply, as
shown below.
subassembly
Installing and Removing Options 5-17