If the math coprocessor in your system does not seem to be operating properly, check the following:
1.If you have the 25 MHz model and replaced the 80486SX microprocessor with an 80487SX chip, make sure you set jumpers JP1 through JP3 to indicate that you installed a math coprocessor. See Chapter 6 for instructions.
2.Run the Setup program to make sure the math coprocessor is listed as installed on the Exit display. If it is listed as not installed, your dealer may have installed the math coprocessor incorrectly. See Chapters 2 and 6 for more information.
Caution
Do not attempt to remove the microprocessor yourself. Contact your dealer to remove it for you.
3.If your math coprocessor is listed as installed in the Setup program but still does not seem to be working, test it
by running the System diagnostics program on your Reference diskette. See Appendix C for instructions.