IBM ThinkPad 380XD, User Manual, Page: 70 / 222

Using an External Pointing Device
You can connect an external keyboard to your computer through the
keyboard/mouse cable (available separately as an option).
It will
not work if it is connected directly to the computer.
When the external keyboard is attached, the following are not
available:
The numeric keypad on the computer keyboard
The external numeric keypad
Instead, use the numeric keypad on the external keyboard.
When you attach the external keyboard, turn off the computer, attach
the keyboard to the keyboard port of the keyboard/mouse cable
1
,
and then attach the keyboard/mouse cable to the computer
2
.
1
2
Keyboard/Mouse cable
Keyboard port
Note: A mouse, an external keypad, and external keyboard are optional.
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IBM ThinkPad 380XD/385XD User's Guide