Epson 386/25 - Manual (Page 141)

Additionally, you may need to add some commands in your
configuration files. See your MS-DOS Reference Manual and
the manual that comes with your option card for instructions.
You may also want to test a newly-installed option. Some
options come with their own diagnostics test programs, and you
can test others with the diagnostics programs on your Reference
diskette. You can use the System diagnostics program on your
Reference diskette to test the following:
❏ System memory
❏ Math coprocessor
❏
Serial and parallel ports
❏ Disk drives
❏ Monitors and display adapters
❏ Dot-matrix printers.
See Appendix E for instructions.
Installing and Removing Options
5-33