If you want to know if you have an adapter (with a coprocessor) installed
in your Macintosh without checking the computer physically, you need to use
a software utility: nothing in the Macintosh operating system gives you
this information.
There are several shareware CDEVs that report system configuration, as well
as many disk and file utilities, such as SUM II and MacTest. Also, some
applications (Microsoft Excel is one) report the presence of a coprocessor.