Apple Macintosh PowerBook 1400 - Manual (Page 68)

Adding memory to your computer
Your Macintosh PowerBook comes with at least 12 MB of RAM. You can
increase your computer’s memory by adding a RAM expansion card. You can
find out how much memory your computer has by choosing About This
Macintosh from the Apple (K) menu in the Finder.
You can purchase memory upgrades from Apple-authorized dealers. For
complete instructions on installing a RAM expansion card, see Appendix C.
Your Macintosh PowerBook also supports virtual memory, a feature that
makes use of hard disk space to provide additional RAM. Your computer was
developed to take advantage of the virtual memory feature and comes with
virtual memory turned on.
For information on using virtual memory, see the “Memory” topic area of
Mac OS Guide, available in the Guide (h) menu.
Using infrared file transfer
Your Macintosh PowerBook has a built-in infrared (IR) window that can send
and receive files. You can exchange information with another PowerBook that
has IR capability or with a desktop computer that’s using an external IR
module.
To transfer files, your computer and the other IR device must be within 3 feet
of each other, with their IR windows facing. You use the Apple IR File
Exchange program, on your computer’s hard disk, to send and receive files.
Complete instructions for using the software are provided in the Apple IR File
Exchange Guide (available in the Guide [h] menu when IR software is the
active application).
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