Epson Apex 20020 - Manual (Page 134)

Post-installation Setup
After you install or remove an option card, you may need to
run the Setup program to update the configuration
information. For example, if you add a second diskette drive,
you need to tell the computer that it has the additional drive.
See Chapter 2 of this guide for information on the Setup
program.
You may also need to add some commands in the configuration
files on your system disk as well. See the description of
CONFIG.SYS in your MS-DOS Reference Manual for
instructions.
When you finish installing an option card and reconfiguring
the system, you should test the card if possible. Some option
cards come with their own diagnostics programs, and you can
test others with the diagnostics programs on your Reference
diskette. The options you can test with the diagnostics
programs include the following:
Expansion memory
80287 math coprocessor
Serial and parallel ports
Monitors and display adapters
Disk drives.
See Appendix C for instructions