Epson 3865X Plus User Manual page 31

Caution
Although the mouse and keyboard connectors are physically
identical, they cannot be used interchangeably. Take care to
insert the mouse plug into the mouse port.
Once you have connected a mouse, you may need to add
commands to your MS-DOS CONFIG.SYS file to enable your
computer
and the manual that came with your mouse for instructions.
Note
If you want to use a mouse or other pointing device
connected to a port on an option card in your computer, you
can disable the built-in mouse connector by changing a
jumper setting in the computer. See Chapter 5 for
instructions.
1-14
Setting Up Your System
mouse connector "
a
use mouse. See your MS-DOS Reference Manual
to