Sony PCG-F540 Primary User Manual page 93

In the future you may want to install memory modules to expand the
functionality of your computer. You can increase memory up to 256 MB
(128 MB x 2), by installing optional memory modules. For PCG-F580/
PCG-F580K/PCG-F590/PCG-F590K, 128 MB of memory are already
installed (128 MB x 1). For PCG-F540/PCG-F540K/PCG-F560/
PCG-F560K/PCG-F570/PCG-F580/PCG-F580K, 64 MB of memory are
already installed (64 MB x 1). You can add an expansion memory module
in a slot. 64 MB and 128 MB expansion memory modules are available as
optional memory modules. For memory upgrades, use only PC-100
SDRAM SO-DIMM (gold lead contacts).
The procedures described below assume familiarity with the general
terminology associated with personal computers and with the safety
practices and regulatory compliance required for using and
modifying electronic equipment.
Disconnect the system from its power source and from any
telecommunications links, networks, or modems before you open the
system or follow any of the procedures described below. Failure to do
so may result in personal injury or equipment damage.