Epson EQUITY 386SX/16 PLUS - Manual (Page 234)

Math Coprocessor Problems
If your math coprocessor does not seem to be operating
properly, check the following:
1. Run the SETUP program and check to make sure that the
math coprocessor is listed as Installed on the SETUP
display. If it is listed as Not installed,
you
or your
dealer may have installed the coprocessor incorrectly. See
Chapters 2 and 5 for more information.
Caution
Do not attempt to remove the math coprocessor
yourself. Contact your dealer for information about a
special extraction tool that is needed to remove it.
2. If your math coprocessor is listed as Installed in the
SETUP program but still does not seem to be working,
check the manual that came with it for troubleshooting
information and for any diagnostic procedures you can
perform.
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Troubleshooting