Epson Progression U12 - Manual (Page 93)

5. If you installed the ODP486DX/33, you need to change the
jumper setting of W3. See page 3-19 for instructions.
6.
Reinstall the CPU card as described on page 3-19.
7. After you replace the computer’s cover, run the SETUP
program so your computer can update its configuration.
See Chapter 2 of the Setup Guide for instructions. (You need
only run the program and save the configuration; you do
not need to change any settings.)
Installing a Math Coprocessor
A math coprocessor speeds up the numeric calculations your
computer performs when using some applications. It also
increases the speed at which graphic images are displayed on
your monitor when you use certain graphics programs.
Roth the 486DX/33 and the 486DX2/66 CPU cards have a math
coprocessor built into the microprocessor, but they also have an
additional socket in which you can install a Weitek 4167 math
coprocessor. On the 486SX/25 card, you can install a 487SX/25
microprocessor chip in the OverDrive module socket. This
microprocessor has a built-in math coprocessor and replaces
the 486SX/25 microprocessor on the card.
Note
If you install the 487SX/25 microprocessor chip, you cannot
also install an OverDrive module on the card because both
options require the same socket.
3-24 Installing and Removing Options