Epson 890 User Manual page 94

Your ActionPoint touchpad is disabled
when you connect a device to the
external keyboard/mouse port and use it
before you use the touchpad.
If you connect a pointing device to the
serial port (rather than the mouse port),
however, you must disable the touchpad
in Setup. See "Changing the Settings" in
Chapter 6 for instructions
Make sure you connected the device to
the external keyboard/mouse port (or
serial port) before you turned on the
computer, as described in "Using an
External Keyboard, Mouse, or Other
Pointing Device" in Appendix B.
If the device is connected to the
computer's serial port, make sure the
device and the serial port options in Setup
are set to use the same memory address or
COM port See "Changing the Settings" in
Chapter 6 for more information
If you still have trouble with an external
device, check the manual that came with
it or contact the manufacturer.
Troubleshooting 7-15