Epson EL 486UC - Manual (Page 78)

post-installation Procedures
After you install or remove options such as memory modules
or a microprocessor, you must run SETUP to update the
computer’s configuration. See Chapter 2 for instructions.
Additionally, you may need to add some commands to your
configuration files. See your operating system manual and the
manual that came with your optional equipment.
4-30 Installing and Removing Options