Dell Inspiron 3800 System Reference Manual page 105

Ports and Connectors: Dell Inspiron 3800 System Reference
NOTE: If the computer is in standby mode or save-to-disk suspend (S2D)
mode when you attach an external keyboard, the device is recognized
immediately by the computer when it resumes normal operation.
You can use the computer's keyboard and an external keyboard at the same time. When you
attach a keyboard to the computer, the embedded numeric keypad is automatically disabled.
On an external keyboard, the <Scroll Lock> key acts the same way as the <Fn> key on the
computer's keyboard (if the External Hot Key option is enabled in the System Setup program).
You can also connect an external keyboard to the APR.
Connecting an External Keypad
You can attach a PS/2-compatible external numeric keypad to the computer's mini-DIN keypad
connector.
NOTE: If the computer is in standby mode or S2D mode when you attach an
external keypad, the device is recognized immediately by the computer when
it resumes normal operation.
When you attach a numeric keypad to the computer, the embedded numeric keypad is
automatically disabled. The indicators on the integrated keyboard track the operation of an
external numeric keypad.
You can also connect an external keypad to the APR.
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