Epson EQUITY 386SX/16 PLUS - Manual (Page 30)

mouse connector
caution
Although the mouse and keyboard connectors are
physically identical, they cannot be used interchangeably.
Be sure 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 to use a mouse. See your MS-DOS Reference
Manual 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
the setting of jumper J4. See Chapter 5 for instructions.
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Setting Up Your System