Epson Equity 286 PLUS - Manual (Page 120)

Carefully follow these steps to install a math coprocessor:
1.
2.
3.
4.
5.
Remove the computer’s cover. See page 5-2 for instructions.
Remove the subassembly. See page 5-18.
Remove the math coprocessor from its package and set it
aside.
If you are installing an 8 MHz math coprocessor, set
jumper J2 to position A; for a 10 MHz coprocessor, set J2 to
position B. See page 5-7 for instructions.
Turn the computer so the front panel is facing you. The
math-coprocessor socket is located on the front of the main
system board next to the SIMM sockets, as shown below.
SIMM sockets
math coprocessor
5-30 Installing
and Removing Options