Compaq Presario,Presario 1211 Supplementary Manual page 20

Take a look at the left
and right sides of your
Notebook. This is where
the CD or DVD drive,
diskette drive, battery and
PC Card slot are located.
"Inserting the Battery" in
Chapter 3 of this guide for
more information about the
battery.
PC Cards are credit card-sized
removable options that
expand the capability of
your Notebook.