Apple Macintosh PowerBook 1400 - Manual (Page 171)

Installing an expansion slot card
You can install an expansion slot card in your PowerBook to add a port for
external connections to the computer. One type of expansion slot card
available for your Macintosh PowerBook 1400 series computer provides a
video connection for an external monitor.
You need the expansion slot card and small Phillips and flat-blade
screwdrivers for the installation.
To install an expansion slot card, follow these steps:
1 Disconnect all cables from the computer, including the power adapter. Make sure the
computer is turned off.
2 Remove the battery from the computer.
If you’re unfamiliar with this procedure, follow the instructions in “Removing
or Replacing the Battery” in Chapter 5 of this manual.
3 Open the door that covers the ports on the back panel of the computer.
WARNING Do not install an expansion slot card without disconnecting
the power adapter and removing the battery. Installing a card while a
power source is connected could damage the computer.
171 Installing Expansion Cards