Apple Macintosh PowerBook 1400 - Manual (Page 160)

Installing a RAM card
You need the RAM card and small Phillips and flat-blade screwdrivers for the
installation.
Make sure you are installing a RAM card made for a Macintosh PowerBook
1400 series computer. The RAM card must use low-profile memory chips.
The card has connectors on the top and bottom so that another RAM card can
be plugged into it, piggyback style. You can install this type of card in the
lower position (if no RAM card is already installed) or the upper position (if
a RAM card is already installed).
To install the RAM card, follow these steps:
1 Check the amount of RAM currently installed in your computer by choosing About This
Macintosh from the Apple (
K
) menu.
You must be in the Finder to see About This Macintosh. If necessary, click
anywhere on the desktop to make the Finder active.
Make a note of the amount of built-in memory.
2 Disconnect all cables from the computer, including the power adapter. Make sure the
computer is turned off.
Connector
Low-profile memory chips
(The number and position of the
chips on your RAM card may differ
from those shown.)
Connector
160 Appendix C