IBM ThinkPad 310E - Attaching an External Numeric Keypad or a Mouse

Attaching an External Numeric Keypad or a Mouse
Chapter 6. Installing and Removing Options 6-11
Attaching an External Numeric Keypad or a Mouse
Attention:
When you connect a mouse other
than an IBM PS/2 Miniature Mouse,
turn off the computer.
An external numeric keypad or a mouse can be attached directly to
the external input-device connector at the rear of the computer.
You can use both the IBM PS/2 Miniature Mouse and TrackPoint III
as the pointing device.
Note:
You can remove the keyboard cover
and use it as a stand for the keypad.
If you want to use the external numeric keypad and mouse at the
same time, first connect the keypad cable to the computer; then
connect the mouse cable to the connector at the rear of the
keypad.