Dell Inspiron 4000 Service Manual page 62

Use this connector to attach a serial device to the computer.
Parallel Connector
Use this connector to attach a parallel device, such as a printer, to the computer.
Docking Connector
Use this connector to attach your computer to the optional advanced port replicator. An advanced port replicator allows you to easily use
an external keyboard, mouse, and monitor with your computer. It also includes a network connector for connecting your computer to a
network.
HINT: The port replicator may not be available in certain countries.
Refer to the documentation that came with your port replicator for instructions on attaching external devices to the port replicator and connecting your
computer to it.
PS/2 Connector
Use this connector to attach PS/2-compatible devices such as a mouse, keyboard, or external numeric keypad to your computer.
USB Connector
Use this connector to attach USB-compatible devices such as a mouse, keyboard, printer, or scanner to your computer.
Video Connector
Use this connector to attach an external monitor to the computer.
AC Adapter Connector
Use this connector to attach an AC adapter to the computer.
HINT: Although the AC adapter works worldwide, power connectors vary among countries. Before using the AC adapter in a foreign country, you may
need to obtain a new power cable designed for use with the electrical outlets in that country.
The AC adapter converts AC power to the DC power required by the computer. You can connect the AC adapter with your computer either turned on or off.