Sony PCG-F420 Primary User Manual page 81

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-F490, 128
MB of memory are already installed (128 MB x 1). For PCG-F480 and
PCG-F420, 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). Sony computer supplies, accessories, and peripherals can be
purchased from your Sony-authorized dealer or by contacting Sony at
http://www.sony.com/accessories.
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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.