Lenovo ThinkPad 390X User's Reference for ThinkPad 390 - Page 76

If you want to use both the external numeric keypad and mouse at, the same time

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Attaching an External Mouse, Keypad or Keyboard 3. Turn on the computer. The TrackPoint is disabled automatically. Attention: If you want to use a serial mouse, you need to connect the mouse, and disable the TrackPoint (see "Disabling the TrackPoint" on page 62, then restart the computer). If you are connecting an external mouse other than a serial mouse or a PS/2 mouse, you need to connect the mouse, then restart the computer). If you want to use both the external numeric keypad and mouse at the same time, first connect the keypad cable to the computer; then connect the mouse cable (1) to the connector at the rear of the keypad. Note: You can remove the keypad cover and use it as a stand for the keypad. 60 ThinkPad 390 User's Reference

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Attaching an External Mouse, Keypad or Keyboard
3. Turn on the computer.
The TrackPoint is disabled automatically.
Attention:
If you want to use a serial mouse, you need to connect
the mouse, and disable the TrackPoint (see “Disabling the
TrackPoint” on page
62, then restart the computer). If you are con-
necting an external mouse other than a serial mouse or a PS/2
mouse, you need to connect the mouse, then restart the computer).
If you want to use both the external numeric keypad and mouse at
the same time, first connect the keypad cable to the computer; then
connect the mouse cable (1) to the connector at the rear of the
keypad.
Note:
You can remove the keypad cover and use it as a stand for
the keypad.
60
ThinkPad 390 User's Reference