Apple Macintosh PowerBook 180 computers - Manual (Page 261)

Sound output devices
The PowerBook also has a sound output port (marked with the
icon
- ) to which you can connect speakers, an amplifier,
headphones, or other audio output devices. The sound output
port accepts a standard stereo miniplug, like that used to attach
headphones to a portable tape player.
Adding memory to your computer
Your PowerBook computer comes with at least 4 MB of RAM.
By adding memory upgrade cards you can increase your
computer’s memory. You can find out how much memory your
computer has by choosing About This Macintosh from the
Finder’s Apple menu.
Apple provides memory upgrades through its authorized dealers.
Memory upgrades are also available from other vendors; ask your
dealer for more information.
Apple recommends that memory upgrades be installed by an
authorized Apple dealer.
Your PowerBook computer also supports virtual memory, a
feature that makes use of hard disk space to provide additional
RAM.
Chapter 14: Expanding Your Computer System 245